SlideShare a Scribd company logo
1 of 3
Electricity worksheet

1.   Read the passage and then answer the questions at the end.

     What is lightning?

     Lightning has been a source of wonder to all generations. Its origins, in the processes of the
     electrification of thunderstorms, are being studied by means of laboratory experiments, together
     with observational and theoretical studies.

     Summer airmass storms and winter-time cold frontal storms can become electrified and produce
     lightning and thunder. The high currents in the lightning strokes (typically 20 000 A) heat the air
     sufficiently to cause rapid expansion; the resulting shock wave is heard as thunder. Travelling at
     the speed of sound, 340 m s–1, the noise arrives after the flash is seen and so the distance to the
     storm may be estimated. The flash is seen as a result of the effect of the electrical discharge on
     the gases through which the discharge travels. The lightning may occur completely within the
     cloud as a cloud stroke, often called sheet lightning, or it may reach the Earth as a ground stroke.

     In the production of a ground stroke, the lightning channel first makes its way towards the
     ground as a weakly luminous negative leader which attracts positive charge from sharp objects
     on the ground. This leader is a column of negatively charged ions which flow from the charged
     lower regions of the cloud in a stepwise fashion to form a conducting channel between the cloud
     and the ground. When a conducting channel is completed the negative charge flows to the
     ground. The brightest part of the channel appears to move upwards at about 30% of the speed of
     light. Often there is sufficient charge available to allow several strokes to occur along the same
     lightning channel within a very short time. The resulting flickering can be observed by the eye
     and the whole series of strokes is called a flash. The peak electrical power is typically 1 × 10 8 W
     per metre of channel, most of which is dissipated in heating the channel to around 30 000ºC.

     In London the average number of days per year on which thunder is heard is 17, the peak
     thunderstorm activity being in the late afternoon and evening during summer. When a person is
     struck by lightning, heart action and breathing stop immediately. Heart action usually starts
     again spontaneously but breathing may not and, on average, four people are killed by lightning
     each year in Britain.

     (a)   (i)    Explain how the distance from an observer to a lightning flash may be estimated.
                  Illustrate this for the case where the distance is 1.5 km.

           (ii)   Explain the meaning of the phrase sheet lightning (paragraph 2).
                                                                                                            (5)

     (b)   The diagram represents a storm cloud over a building with a high clock tower.

                                                                  C lo u d




                                                                  E a rth

           Copy the diagram. Explain, with the aid of additions to your diagram, what is meant by a
           negative leader (paragraph 3).
                                                                                                            (5)
     (c)   Suppose lightning strikes from a cloud to the Earth along a channel 400 m long.
           Calculate:

                                                                                                             1
(i)     a typical potential difference between cloud and Earth,

       (ii)    the average electric field strength along such a lightning channel.
                                                                                                                     (5)

(d)                   (i)             Use the passage to explain how thunder is produced.

       (ii)    Estimate the pressure of the air within a lightning channel immediately after a
               lightning flash. Take the atmospheric pressure to be 100 kPa. State any
               assumptions you make.
                                                                                                                     (7)

(e)    Suggest why those who are killed each year by lightning are usually alone.
                                                                                                                     (2)

(f)    The flash is seen as a result of the electrical discharge on the gases through which the
       discharge travels (paragraph 2).

       Rewrite this sentence using the phrases “ionises or excites” and “visible photons”. You
       may be awarded a mark for the clarity of your answer.
                                                                                                                     (4)

(g)    Describe how you would attempt to demonstrate in the laboratory that the electric field
       strength needed to produce a spark in air is about 3000 V mm–1 (3 × 106 V m–1).

       Suggest why this value differs from that which you calculated in (c)(ii).
                                                                                                                    (4)
                                                                                                       (Total 32 marks)

[The passage is taken from “Scientific Statement on Lightning”. Dr C P R Saunders, Weather, Vol 49 No 1, the Royal
Meteorological Society. Reproduced by permission.]
Electricity worksheet

2.   A polythene rod was negatively charged by rubbing it with a cloth. The rod was then stroked
     several times across the metal cap of a meter used for measuring charge.

                                                                        C h a rg e d
                                                                        p o ly th e n e ro d




                            M e te r

     The initial reading on the meter was zero.

                                                     –8
     After 3.8 s the final reading was –6.4 × 10 C.

     Calculate the number of electrons that were transferred to the metal cap.

     ……….…………………………………………………………………………………………….

     ……….…………………………………………………………………………………………….

                                                     Number of electrons = …………………………
                                                                                                              (3)

                                         –1
     Calculate the average rate in C s        at which charge was transferred to the metal cap.

     ……….…………………………………………………………………………………………….

     ……….…………………………………………………………………………………………….
                                                                                                  –1
                                                      Rate = …………………………………… C s
                                                                                                              (2)

     State the base unit for the rate of flow of charge.

     ……….…………………………………………………………………………………………….
                                                                                                              (1)
                                                                                                  (Total 6 marks)




                                                                                                               3

More Related Content

Similar to Electricity worksheet

X physics full notes chapter 2
X physics full notes chapter 2X physics full notes chapter 2
X physics full notes chapter 2
neeraj_enrique
 
Cbse physisc question paper 2014
Cbse physisc question paper 2014Cbse physisc question paper 2014
Cbse physisc question paper 2014
Anushri Kocher
 
Electronics module
Electronics moduleElectronics module
Electronics module
Ota Keiko
 
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docxAssignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
ursabrooks36447
 
13925cbse guess 5
13925cbse guess 513925cbse guess 5
13925cbse guess 5
ashikjose
 

Similar to Electricity worksheet (20)

Waves q
Waves qWaves q
Waves q
 
Waves q
Waves qWaves q
Waves q
 
Waves q
Waves qWaves q
Waves q
 
X physics full notes chapter 2
X physics full notes chapter 2X physics full notes chapter 2
X physics full notes chapter 2
 
Homework of chapter 38
Homework of chapter 38Homework of chapter 38
Homework of chapter 38
 
Cbse physisc question paper 2014
Cbse physisc question paper 2014Cbse physisc question paper 2014
Cbse physisc question paper 2014
 
Electronics module
Electronics moduleElectronics module
Electronics module
 
Physics sample question paper 2020
Physics sample question paper 2020 Physics sample question paper 2020
Physics sample question paper 2020
 
CBSE Sample Paper 2015 of Class XII Physics
CBSE Sample Paper 2015 of Class XII PhysicsCBSE Sample Paper 2015 of Class XII Physics
CBSE Sample Paper 2015 of Class XII Physics
 
Physics sqp
Physics sqpPhysics sqp
Physics sqp
 
MS 2018- Phy Theory bhsec.pptx
MS 2018- Phy Theory bhsec.pptxMS 2018- Phy Theory bhsec.pptx
MS 2018- Phy Theory bhsec.pptx
 
Cbse 12 Class Physics Sample Paper 2010 Model 2
Cbse 12 Class Physics Sample Paper 2010 Model 2Cbse 12 Class Physics Sample Paper 2010 Model 2
Cbse 12 Class Physics Sample Paper 2010 Model 2
 
Bioanalysis Midterm nov.2010 3rd-biom
Bioanalysis Midterm nov.2010 3rd-biomBioanalysis Midterm nov.2010 3rd-biom
Bioanalysis Midterm nov.2010 3rd-biom
 
Periodic material-based vibration isolation for satellites
Periodic material-based vibration isolation for satellitesPeriodic material-based vibration isolation for satellites
Periodic material-based vibration isolation for satellites
 
Periodic material-based vibration isolation for satellites
Periodic material-based vibration isolation for satellitesPeriodic material-based vibration isolation for satellites
Periodic material-based vibration isolation for satellites
 
Chapter 8 overvoltage phenomenon and insulation coordination.ppt
Chapter 8 overvoltage phenomenon and insulation coordination.pptChapter 8 overvoltage phenomenon and insulation coordination.ppt
Chapter 8 overvoltage phenomenon and insulation coordination.ppt
 
Insulation Coordination
Insulation CoordinationInsulation Coordination
Insulation Coordination
 
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docxAssignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
Assignment 3 (CH. 7-9)Chapter 7Questions (use complete sentenc.docx
 
13925cbse guess 5
13925cbse guess 513925cbse guess 5
13925cbse guess 5
 
Class 11 important questions for physics Refraction of Light
Class 11 important questions for physics Refraction of LightClass 11 important questions for physics Refraction of Light
Class 11 important questions for physics Refraction of Light
 

Recently uploaded

Financial Accounting IFRS, 3rd Edition-dikompresi.pdf
Financial Accounting IFRS, 3rd Edition-dikompresi.pdfFinancial Accounting IFRS, 3rd Edition-dikompresi.pdf
Financial Accounting IFRS, 3rd Edition-dikompresi.pdf
MinawBelay
 

Recently uploaded (20)

Navigating the Misinformation Minefield: The Role of Higher Education in the ...
Navigating the Misinformation Minefield: The Role of Higher Education in the ...Navigating the Misinformation Minefield: The Role of Higher Education in the ...
Navigating the Misinformation Minefield: The Role of Higher Education in the ...
 
Features of Video Calls in the Discuss Module in Odoo 17
Features of Video Calls in the Discuss Module in Odoo 17Features of Video Calls in the Discuss Module in Odoo 17
Features of Video Calls in the Discuss Module in Odoo 17
 
How to Analyse Profit of a Sales Order in Odoo 17
How to Analyse Profit of a Sales Order in Odoo 17How to Analyse Profit of a Sales Order in Odoo 17
How to Analyse Profit of a Sales Order in Odoo 17
 
demyelinated disorder: multiple sclerosis.pptx
demyelinated disorder: multiple sclerosis.pptxdemyelinated disorder: multiple sclerosis.pptx
demyelinated disorder: multiple sclerosis.pptx
 
Championnat de France de Tennis de table/
Championnat de France de Tennis de table/Championnat de France de Tennis de table/
Championnat de France de Tennis de table/
 
UChicago CMSC 23320 - The Best Commit Messages of 2024
UChicago CMSC 23320 - The Best Commit Messages of 2024UChicago CMSC 23320 - The Best Commit Messages of 2024
UChicago CMSC 23320 - The Best Commit Messages of 2024
 
“O BEIJO” EM ARTE .
“O BEIJO” EM ARTE                       .“O BEIJO” EM ARTE                       .
“O BEIJO” EM ARTE .
 
PSYPACT- Practicing Over State Lines May 2024.pptx
PSYPACT- Practicing Over State Lines May 2024.pptxPSYPACT- Practicing Over State Lines May 2024.pptx
PSYPACT- Practicing Over State Lines May 2024.pptx
 
Exploring Gemini AI and Integration with MuleSoft | MuleSoft Mysore Meetup #45
Exploring Gemini AI and Integration with MuleSoft | MuleSoft Mysore Meetup #45Exploring Gemini AI and Integration with MuleSoft | MuleSoft Mysore Meetup #45
Exploring Gemini AI and Integration with MuleSoft | MuleSoft Mysore Meetup #45
 
Removal Strategy _ FEFO _ Working with Perishable Products in Odoo 17
Removal Strategy _ FEFO _ Working with Perishable Products in Odoo 17Removal Strategy _ FEFO _ Working with Perishable Products in Odoo 17
Removal Strategy _ FEFO _ Working with Perishable Products in Odoo 17
 
....................Muslim-Law notes.pdf
....................Muslim-Law notes.pdf....................Muslim-Law notes.pdf
....................Muslim-Law notes.pdf
 
MOOD STABLIZERS DRUGS.pptx
MOOD     STABLIZERS           DRUGS.pptxMOOD     STABLIZERS           DRUGS.pptx
MOOD STABLIZERS DRUGS.pptx
 
Incoming and Outgoing Shipments in 2 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 2 STEPS Using Odoo 17Incoming and Outgoing Shipments in 2 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 2 STEPS Using Odoo 17
 
philosophy and it's principles based on the life
philosophy and it's principles based on the lifephilosophy and it's principles based on the life
philosophy and it's principles based on the life
 
Graduate Outcomes Presentation Slides - English (v3).pptx
Graduate Outcomes Presentation Slides - English (v3).pptxGraduate Outcomes Presentation Slides - English (v3).pptx
Graduate Outcomes Presentation Slides - English (v3).pptx
 
Financial Accounting IFRS, 3rd Edition-dikompresi.pdf
Financial Accounting IFRS, 3rd Edition-dikompresi.pdfFinancial Accounting IFRS, 3rd Edition-dikompresi.pdf
Financial Accounting IFRS, 3rd Edition-dikompresi.pdf
 
Pragya Champions Chalice 2024 Prelims & Finals Q/A set, General Quiz
Pragya Champions Chalice 2024 Prelims & Finals Q/A set, General QuizPragya Champions Chalice 2024 Prelims & Finals Q/A set, General Quiz
Pragya Champions Chalice 2024 Prelims & Finals Q/A set, General Quiz
 
Mattingly "AI and Prompt Design: LLMs with Text Classification and Open Source"
Mattingly "AI and Prompt Design: LLMs with Text Classification and Open Source"Mattingly "AI and Prompt Design: LLMs with Text Classification and Open Source"
Mattingly "AI and Prompt Design: LLMs with Text Classification and Open Source"
 
24 ĐỀ THAM KHẢO KÌ THI TUYỂN SINH VÀO LỚP 10 MÔN TIẾNG ANH SỞ GIÁO DỤC HẢI DƯ...
24 ĐỀ THAM KHẢO KÌ THI TUYỂN SINH VÀO LỚP 10 MÔN TIẾNG ANH SỞ GIÁO DỤC HẢI DƯ...24 ĐỀ THAM KHẢO KÌ THI TUYỂN SINH VÀO LỚP 10 MÔN TIẾNG ANH SỞ GIÁO DỤC HẢI DƯ...
24 ĐỀ THAM KHẢO KÌ THI TUYỂN SINH VÀO LỚP 10 MÔN TIẾNG ANH SỞ GIÁO DỤC HẢI DƯ...
 
Operations Management - Book1.p - Dr. Abdulfatah A. Salem
Operations Management - Book1.p  - Dr. Abdulfatah A. SalemOperations Management - Book1.p  - Dr. Abdulfatah A. Salem
Operations Management - Book1.p - Dr. Abdulfatah A. Salem
 

Electricity worksheet

  • 1. Electricity worksheet 1. Read the passage and then answer the questions at the end. What is lightning? Lightning has been a source of wonder to all generations. Its origins, in the processes of the electrification of thunderstorms, are being studied by means of laboratory experiments, together with observational and theoretical studies. Summer airmass storms and winter-time cold frontal storms can become electrified and produce lightning and thunder. The high currents in the lightning strokes (typically 20 000 A) heat the air sufficiently to cause rapid expansion; the resulting shock wave is heard as thunder. Travelling at the speed of sound, 340 m s–1, the noise arrives after the flash is seen and so the distance to the storm may be estimated. The flash is seen as a result of the effect of the electrical discharge on the gases through which the discharge travels. The lightning may occur completely within the cloud as a cloud stroke, often called sheet lightning, or it may reach the Earth as a ground stroke. In the production of a ground stroke, the lightning channel first makes its way towards the ground as a weakly luminous negative leader which attracts positive charge from sharp objects on the ground. This leader is a column of negatively charged ions which flow from the charged lower regions of the cloud in a stepwise fashion to form a conducting channel between the cloud and the ground. When a conducting channel is completed the negative charge flows to the ground. The brightest part of the channel appears to move upwards at about 30% of the speed of light. Often there is sufficient charge available to allow several strokes to occur along the same lightning channel within a very short time. The resulting flickering can be observed by the eye and the whole series of strokes is called a flash. The peak electrical power is typically 1 × 10 8 W per metre of channel, most of which is dissipated in heating the channel to around 30 000ºC. In London the average number of days per year on which thunder is heard is 17, the peak thunderstorm activity being in the late afternoon and evening during summer. When a person is struck by lightning, heart action and breathing stop immediately. Heart action usually starts again spontaneously but breathing may not and, on average, four people are killed by lightning each year in Britain. (a) (i) Explain how the distance from an observer to a lightning flash may be estimated. Illustrate this for the case where the distance is 1.5 km. (ii) Explain the meaning of the phrase sheet lightning (paragraph 2). (5) (b) The diagram represents a storm cloud over a building with a high clock tower. C lo u d E a rth Copy the diagram. Explain, with the aid of additions to your diagram, what is meant by a negative leader (paragraph 3). (5) (c) Suppose lightning strikes from a cloud to the Earth along a channel 400 m long. Calculate: 1
  • 2. (i) a typical potential difference between cloud and Earth, (ii) the average electric field strength along such a lightning channel. (5) (d) (i) Use the passage to explain how thunder is produced. (ii) Estimate the pressure of the air within a lightning channel immediately after a lightning flash. Take the atmospheric pressure to be 100 kPa. State any assumptions you make. (7) (e) Suggest why those who are killed each year by lightning are usually alone. (2) (f) The flash is seen as a result of the electrical discharge on the gases through which the discharge travels (paragraph 2). Rewrite this sentence using the phrases “ionises or excites” and “visible photons”. You may be awarded a mark for the clarity of your answer. (4) (g) Describe how you would attempt to demonstrate in the laboratory that the electric field strength needed to produce a spark in air is about 3000 V mm–1 (3 × 106 V m–1). Suggest why this value differs from that which you calculated in (c)(ii). (4) (Total 32 marks) [The passage is taken from “Scientific Statement on Lightning”. Dr C P R Saunders, Weather, Vol 49 No 1, the Royal Meteorological Society. Reproduced by permission.]
  • 3. Electricity worksheet 2. A polythene rod was negatively charged by rubbing it with a cloth. The rod was then stroked several times across the metal cap of a meter used for measuring charge. C h a rg e d p o ly th e n e ro d M e te r The initial reading on the meter was zero. –8 After 3.8 s the final reading was –6.4 × 10 C. Calculate the number of electrons that were transferred to the metal cap. ……….……………………………………………………………………………………………. ……….……………………………………………………………………………………………. Number of electrons = ………………………… (3) –1 Calculate the average rate in C s at which charge was transferred to the metal cap. ……….……………………………………………………………………………………………. ……….……………………………………………………………………………………………. –1 Rate = …………………………………… C s (2) State the base unit for the rate of flow of charge. ……….……………………………………………………………………………………………. (1) (Total 6 marks) 3