1. Tips are provided for taking online classes effectively, including being prepared, treating it like a real course, practicing time management, and eliminating distractions.
2. Inside the class, students are advised to open their camera, mute audio when not speaking, and ask permission before adding notes or sharing.
3. Discipline is important for online students.
ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
MOST IMPORTANT QUESTIONS FOR CURRENT ELECTRICITY CBSE XII BY ATCDeepankur Rastogi
PLS LIKE MY FIRST PHYSICS BOOK FRIENDS... #RAMBAANPHYSICS
FREE COPY OF THE BOOK WILL BE GIVEN TO 5 LIKERS BY A LUCKY DRAW...
https://www.facebook.com/pages/RAM-BAAN-physics/139058272954475?fref=ts —
CURRENT ELECTRICITY/ELECTROSTATICS FOR CBSE FREE REVISION SHEET BY ANURAG TY...ANURAG TYAGI CLASSES (ATC)
ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
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ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
MOST IMPORTANT QUESTIONS FOR CURRENT ELECTRICITY CBSE XII BY ATCDeepankur Rastogi
PLS LIKE MY FIRST PHYSICS BOOK FRIENDS... #RAMBAANPHYSICS
FREE COPY OF THE BOOK WILL BE GIVEN TO 5 LIKERS BY A LUCKY DRAW...
https://www.facebook.com/pages/RAM-BAAN-physics/139058272954475?fref=ts —
CURRENT ELECTRICITY/ELECTROSTATICS FOR CBSE FREE REVISION SHEET BY ANURAG TY...ANURAG TYAGI CLASSES (ATC)
ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
Basic Electrical - Circuit Theory (Multi-choice questions) - Mathankumar.S (V...Mathankumar S
Basic Electrical - Circuit Theory (Multi-choice questions) - Technical Skills Test Question Paper. This question paper is cover more topics and basic questions about circuit theory
Alternating current signal
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CBSE Class 10th Sample eBook, which helps you to understand the chapter in easy way also downaload sample papers and previous year papers and practice to solve the question on time. Download at www.misostudy.com.
Alternating current signal
AC means Alternating Current and DC means Direct Current. AC and DC are also used when referring to voltages and electrical signals which are not currents! For example: a 12V AC power supply has an alternating voltage (which will make an alternating current flow).
CBSE Class 10th Sample eBook, which helps you to understand the chapter in easy way also downaload sample papers and previous year papers and practice to solve the question on time. Download at www.misostudy.com.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electrical-and-Electronics-Engineering
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. TIPS FOR TAKING ONLINE CLASS
FOR YOURSELF
1: Be ready before the starting time
2: Treat an online course like a real course
3: Hold yourself accountable
4: Practice time management
5: Create a regular study space and stay organized
6: Eliminate distractions
7: Figure out how you learn best
8: Actively participate
9: Leverage your network
INSIDE THE CLASS
1: Open your camera
2: Mute your audio
3: take your pen, copy and other material sources
3: Don’t add your note on the screen
4: Do ask, write and share after the permission. It
will be provided at the end of the class
5: Be more disciplined.
2
33. 1.
The emf of an ac source is given by the expression, E = 300 sin 314 t volts.
Write the values of peak voltage and frequency of source. [2074 'A]
Comparing with E = Eo sin ωt,
we get
Eo= 300 and ω = 314 Hence, the peak value of
Eo = 300 V
f = 50 Hz Ans.
34. 2.
Define rms value of ac. How is it related with the peak value of ac?
[2074 'B', supp. 2070, 2nd Exam 2068, 1st Exam 2067, 2064]
It is the steady current which when passed through a given resistance for a given time
produces the same amount of heat as produced by the a.c for the same resistor for the
same time.
𝑖𝑟𝑚𝑠 =
𝑖𝑜
2
Peak Value
35. 3.
Why is choke coil preferable to resistor ? [Supp. 2073, 2071 ‘D’] OR
Choke coil is preferred to a resistor in an alternating current circuit
Why? [Set 'B'2069, 1st Exam 2068,2062, 2057 2055, 2053] OR
Explain why choke coil is used in an a.c. [Supp. 2062]
A choke coil decreases the current without wasting
electrical energy in the form of heat.
36. 4.
Alternating current passes through a capacitor where as direct current does not.
Explain this fact on the basis of capacitive reactance. [2073 ‘D’, Supp.2063]
Xc =
1
2𝜋𝑓𝐶
where f is frequency and C is capacitance
We see that.
(I)for ac current xc ~ small
(ii) for d.c. current f = 0 , xc ~ ∞
37. 5.
How does the resonance frequency of an L.C.R. series circuit change if the plates
of the capacitor are brought closer together ?
𝑐 =
𝜖𝑜𝐴
𝑑 d
+
+
+
+
+
-
-
-
-
-
𝑓 =
1
2𝜋 𝐿𝐶
38. 6.
What is wattles current? [2072'D', 2071 ‘C’ 2067 2nd Exam, 2058]
It doesn't consume any power in a circuit.
In case of wattles current phase difference between
current and e.m.f. should be p/2 in an circuit.
We have power in A.C. is given by
Pav = Irms Erms cosf
In case of inductor f = p/2
Pav = Irms Erms cos p/2 = 0
Hence no power is consumed by an inductor.
39. 7.
What are the advantages of A.C. over D.C. ? [2072'E’]
• Transmission and distribution cheaper
• Easily convertible to DC
• AC machine are stronger and easy to use
• Voltage can be stepped up or down and can reach
distant places
40. Reactance --------resistance offered by an inductor or a
capacitor. The alternating e.m.f. and the current differ
in phase by p/2 when a.c. flows through an inductor or
a capacitor.
Impedance --------effective resistance of a.c. --------------i.e.
the effective resistance offered by LR circuit or CR
circuit or LCR circuit.
𝑍 = 𝑅2 + 𝑋𝑐 − 𝑋𝐿 2
8.
Distinguish between reactance and impedance for an a.c. circuit?
[2054]
41. 9.
Which is more dangerous in use a.c. or d.c.? Why? [2070 set C]
Ans: The a.c. is more dangerous than d.c. of the same voltage.
For a.c. Erms = 220 V means peak value is E0 = 2 Erms = 2 x 220 = 311 V
whereas for 220 V d.c. peak value is (220 V), the same.
42. 10
What do you mean by power factor? On what factors does it
depend?
[2069 set A]
Pav = Irms Erms cosf
Power factor, 𝑐𝑜𝑠𝜙 =
𝑅
𝑅2
+(ω𝐿 −
1
𝜔𝐶
)2
Virtual
Real
Ans: The cosine of the phase angle between alternating
e.m.f. and current in an a.c. circuit is called power
factor.
43. 12.
For a capacitor in an a.c. circuit, explain why there is a phase difference
between current and voltage. [Supp. 2071]
If 𝐼 = 𝐼𝑜𝑠𝑖𝑛𝜔𝑡
Then, 𝐰𝐞 𝐠𝐞𝐭 𝐸 = 𝐸𝑜𝑠𝑖𝑛(𝜔𝑡 −
𝜋
2
)
When Capacitor is connected in the a.c.
Both alternating
C I V I L
44. 13
Fluorescent lights often use an inductor, to limit the current through the tubes. Why is
it better to use an inductor rather than a resistor for this purpose? [2070
'D’]
Inductor consumes
no power
45. 14.
At high frequencies, capacitor becomes a short-circuit and an inductor
becomes an open circuit. Explain. [2069 Set A]
𝑋𝑐 =
1
𝜔𝐶
=
1
2𝜋𝑓𝐶
𝑋𝐿 = 𝜔𝐿 = 2𝜋𝑓𝐿
𝑅 ≈ 0
𝑅 ≈ ∞
46. 15.
Sketch the symbols of "a capacitor", "an inductor" , "emf of a cell"
and "a resistor". [Set 'B' 20691
47. 14
Long-distance, electric power, transmission lines always operate at very high
voltage, some time as much as 750 K. V. What are the advantages of such high
voltages? [2nd Exam 2068]
P = IV = I2R
At Long distance R is significant
49. 1.
A coil of inductance O.1H and negligible resistance is in series with a resistance 40Ω.
A supply voltage of 50V (rms) is connected to them. If the voltage across L is equal
to that across R, calculate the voltage across the inductor and frequency of the
supply. [2074]
C I V I L
VR
E
VL
Φ
𝐸2 = 𝑉2
𝑅 + 𝑉2
𝐿
𝑉𝑅 = 𝑉𝐿
50V
O.1H
40Ω.
𝑽𝑳 = 𝟑𝟓. 𝟑𝟓V
𝒇 = 𝟔𝟑. 𝟕𝑯𝒛
Phasor Diagram
50. 2.
An iron cored coil of inductance 3H and 50Ω resistance is placed in series with a
resistor of 550Ω and a 100V , 50Hz ac supply is connected across the arrangements.
Find the current flowing in the coil and voltage across the coil. [Supp 2073]
3H and 50Ω
550Ω
100V , 50Hz
𝑍 = (𝑅 + 𝑟)2 + 𝑋𝐿2
𝐼 =
𝐸
𝑍
𝑉𝐿 = 𝐼𝑋𝐿 = 𝐼 𝑟2 + 𝑋𝐿2
𝑰 = 𝟎. 𝟎𝟖𝟗𝟓
𝑽𝑳 = 𝟖𝟒. 𝟒𝟕𝑽
51. 3.
L-C-R alternating current series circuit of L = 1H, C = 1𝝁F and R =
100Ω are connected in series With a source of frequency 50 Hz. What
is the phase shift between current and voltage ? [2073 ‘C’]
1H
1𝝁F
100Ω
50 Hz
φ
VR
VL
Vc
𝑉𝐿 − 𝑉𝐶
𝑇𝑎𝑛φ =
𝑋𝐿 − 𝑋𝐶
𝑅
φ = −90𝑜
C I V I L
52. 4.
A coil having inductance and resistance is connected to an oscillator
giving a fixed sinusoidal output voltage of 5V rms. With the oscillator set
at a frequency of 50Hz, the rms current in the coil is 1A and at a
frequency of 100Hz, the rms current is 0.625,A. Determine the
inductance of the coil. [2072'c']
z1=
𝐸
𝐼1
z2=
𝐸
𝐼2
𝑍 = 𝑅2 + 𝑋𝐿2 𝑍2 = 𝑅2 + 𝑋𝐿2
𝑍1
2 = 𝑅2 + 𝑋1𝐿
2 𝑍2
2 = 𝑅2 + 𝑋2𝐿
2
∴ 𝐿 = 1.14 × 10−2H
𝑍1
2 − 𝑍2
2 = 𝑋1𝐿
2 − 𝑋2𝐿
2
53. 5.
A circuit consists of a capacitor of 2𝝁F and a resistor of 1000Ω an
alternating emf of 12V (rms) and frequency 50Hz is applied. Find the
current flowing, the voltage across capacitor and the phase angle between
the applied emf and current. [2071 ‘C’]
𝑧 = 𝑅2 + 𝑋𝐶
2
= 𝟏𝟖𝟕𝟗. 𝟔𝟑𝛀
2𝝁F
1000Ω
12V
50Hz
𝐼 =
𝐸
𝑍
= 𝟔. 𝟑𝟖 × 𝟏𝟎𝟏𝟎−𝟑𝑨
𝑉𝑐 = 𝐼𝑋𝐶
𝑇𝑎𝑛φ =
𝑋𝐶
𝑅
𝝓 = 𝟓𝟕. 𝟖𝟓
𝑶
= 𝟏𝟎. 𝟏𝟔𝐕
54. 6.
An iron cored coil of 2 H and 50 Ω resistance placed in series with a resistor of
450Ω and 200v, 50Hz a.c. supply is connected across the arrangement, find a)
the current flowing in the coil, b) its phase angle relative to the voltage supply,
c) the voltage across the coil. [Supp. 2070]
𝑧 = 𝑅2 + 𝑋𝐿
2
= 𝟖𝟎𝟐. 𝟗𝛀
𝐼 =
𝐸
𝑍
= 𝟎. 𝟐𝟓𝑨
𝑉𝐿 = 𝐼𝑍𝐿
𝑇𝑎𝑛φ =
𝑋𝐿
𝑅
𝝓 = 𝟓𝟏. 𝟓
𝑶
= 𝟏𝟓𝟕. 𝟓𝐕
50Ω
2H
450Ω
200V, 50Hz
𝑟2 + 𝑋𝐿
2
55. 7.
A 50V a.c. supply is connected to a resistor having resistance 50Ω in series
with a solenoid whose inductance is 0.25H. The potential difference
between the ends of the resistor is 25V. Find the resistance of the wire of
solenoid. Take frequency of the ac source 50Hz. [2070 ‘C’]
𝐈 =
𝐄
𝐙
=
𝐄
𝐑+𝐫 𝟐
+ 𝛚𝐋 𝟐
50V
50Ω 0.25H
50Hz
25V
IR = 25
r = 11.89 Ω
56. 8.
Alternating voltage in an ac circuit is represented by
E = 100 𝟐 sin (100 𝝅𝒕) volts. Find its root mean
square value and the frequency. [Set 'B' 2069]
𝑓 =
𝜔
2𝜋
= 50Hz
Erms=
𝐸𝑜
2
= 100V
E = Eo sin ωt
57. 9.
A 100 V, 50Hz AC source is connected to an LCR circuit containing L=8.1 mH, C =
12.5 𝝁𝑭 𝒂𝒏𝒅 𝑹 = 𝟏𝟎 𝜴 all connected in series. Find the potential difference across
the resistor. [1st Exam 2068]
8.1mH
1𝟐. 𝟓𝝁F
10Ω
100V, 50 Hz
𝑍 = 𝑅2 + 𝑋𝑐 − 𝑋𝐿 2
= 252.3Ω
𝐼 =
𝐸
𝑍
= 0.396 A
V = 𝐼𝑅 = 3.96𝑉
58. 10.
A circuit consists of an inductor of 200𝝁𝑯and resistance of 10 Ω in series with
a variable capacitor and a 0.10 V (r.m.s.), 1.0 MHz supply. Calculate (i) the
capacitance to give resonance (ii) the quality factor of the circuit at resonance.
[2nd Exam 2068]
𝑋𝐿 = 𝑋𝐶
𝐶 = 1.266 × 10−10 𝐹
𝑄 =
1
𝑅
𝐿
𝑅
= 1256.89
61. 1.
The conductivity of an electrolyte is very low as
compared to a metal at room temperature, Why?
Hints:
Ion density < electron density
Drift velocity(vd ) of ions is smaller
Resistance offered in electrolyte is more.
62. 2.
Why does voltammeter measure current more
accurately than an ammeter?
Hints
In a voltmeter, I =
𝑚
𝑧𝑡
, m can be measured upto third
decimal place and z is known upto five decimal places, so
value of I can be calculated with a very small error as
compared to that by an ammeter.
63. 3.
What is meant by Faraday constant ?
The quantity of charge required to liberate one gram
equivalent of a substance during electrolysis.
Or
Charge required to liberate one mole of a monovalent
element during electrolysis.
Its value is 96500C mol-1
64. 4.
Define one Faraday.
It is defined as 96500 C of charge required to deposit or
liberate one gram equivalent of a substance.
66. 1.
Assuming Faraday constant to be 96500 C/mole and
relative atomic mass of copper 63, calculate the mass of
copper liberated by 0.5A current in 10 minutes. [2056]
Solution
For copper, m =
𝐴𝐼𝑡
𝐹𝑉
=
63 ×0.5×600
96500×2
Valency
𝒎 = 𝟗. 𝟖 × 𝟏𝟎−𝟓
Kg
67. 2.
In a copper plating system, an electrolysis current of 3
A is used. How many atoms of Cu++ are deposited in
1.5 hr? ( e = - 1.6 × 10-19 C)
Solution
Charge passed in 1.5 hr , Q = It = 3 × 5400 C
Charge carried by each Cu++ atom =2 × 1.6 × 10-19 C
No. of atoms deposited =
3×5400
2×1.6×10−19 = 5.06 × 1022
69. DID YOU ENJOYE THE CLASS?
Leave your valuable suggestions so that I will be
better for you all in the next class. Your
suggestions are highly appreciated.
NO?
Yes?
70.
71. 71
“Thousands and thousands are dying due to
coronavirus and yet when this thing is over the
humanity will declare a victory! What victory?
Fools! There is no victory for the dead people!
And when it comes to the living people,
everyone should have a deep sadness in their
soul, not a brag of victory!”