Electricity Notes part 1

1. AGENDA: INTRO TO ELECTRICITY
MINI-CORNELL NOTES
BELLWORK:
WHAT IS
ELECTRICIT
Y?

3. WHAT IS AN ELECTRON?
The negative charged particle found on the outside of an atom

4. WHAT IS AN ELECTRIC FIELD?
A region in which an electric
charge experiences a force.
+
Away from the
positive charge
-
Towards the
negative
charge

5. YOU KNOW THIS….
Two similar
charges repel
each other

6. YOU KNOW THIS TOO
Two opposite
charges attract
each other.

7. ELECTRIC CURRENT
connecting
wire
electric
cell
filament
flow of electrons
Conductor
Charge
Cross-sectional
area
Definition:
An electric
current is the rate
of flow of electric
charges in a
circuit.

8. HOW DOES ELECTRICITY FLOW?
The battery in a circuit gives
energy to the electrons and
pushes them around a circuit,
from the negative terminal of
the cell, round the circuit and
back to the positive terminal of
the cell.

9. HOW TO MEASURE CURRENT?
The SI unit for electric current is
ampere (A).
Different electrical components and appliances
require different sizes of current to turn them
on.
1 A = 1,000 mA
1 mA = 0.001 A

10. INSTRUMENT TO MEASURE
CURRENT
An ammeter is an instrument used for measuring electric current.

11. AMMETER
It must be connected in series in the circuit.
Positive side of ammeter must be connected
nearest to the positive terminal of the battery
(electric cell), and vice versa.

12. WHAT ARE ELECTRIC CIRCUITS?
Electric circuits are
made up of
electrical
components
These components
must be joined
together without any
gap in between to
form a closed
circuit.
connecting wires
electric cell
circuit boardlight bulb
Note:
Components refer to the
light bulb, wires, battery

13. ELECTRIC CIRCUITS
Incomplete circuits are called open circuits.
connecting wire is
missing
no source of
electrical energy
Both the circuits in the diagram are incomplete, hence they are known
as “open circuits”.

14. AN ELECTRIC CURRENT
FLOWS ONLY WHEN THERE
IS:
a source of electrical energy and
a closed circuit
connecting wires
electric cell
circuit boardlight bulb

15. HOW TO DRAW CIRCUIT DIAGRAMS
Component Symbol Component Symbol
An electric cell Battery
Light bulb (lamp) Switch
Switch (open)
Switch (closed)
Connecting wires
(not joined)
Connecting wires
(joined)
+ +
Symbols are used to represent the various electrical
components in circuits.

18. CAN YOU PREDICT HOW THIS CIRCUIT
WOULD LOOKED LIKE IN ITS SCHEMATIC
FORMAT?

19. SERIES AND
PARALLEL
Thereare 2 ways in whichan electriccircuit
can bearranged:
1. Series
2. Parallel

20. WHAT IS A SERIES
CIRCUIT?
A series circuit connects the components one after the other
A single loop is formed
A break in any part of a series circuit stops the flow of current in the whole circuit.

21. PARALLEL CIRCUIT
A parallel circuit divides into two or more branches.
The current divides and flows through each parallel branch.
If a component breaks or is removed, the other components remain on.

22. Which of the following is a
series circuit?
Which is a parallel circuit?
SeriesCircuit ParallelCircuit

23. Draw the circuit diagram for the
following set up and state whether it
is a series or parallel circuit.

24. Draw the circuit diagram for the
following set up and state whether it is a
series or parallel circuit.

25. Prediction: Which is
brighter? Why?

26. Which of the following is a series
circuit?
Which is a parallel circuit?
Series Circuit Parallel Circuit

27. SUMMARY
Summarize your cornell notes in 2-3 sentences.

28. BELLWORK: GLUE SCALE SHEET INTO NOTEBOOK.
USE YOUR TEXTBOOK TO DEFINE: PAGES 821-822
Current Coulomb
Joules
Amperes
Volts
Watt

29. BELLWORK: USE YOUR TEXTBOOK TO DEFINE:
Current – the number of
coulombs passing a
point in one second
Coulomb- the charge of
6.25 x 1018 electrons,
one lighting bolt
Joules – SI unit for energy
Ampere – flow of one
coulomb per sec
Volts – one joule per
coulomb
Watt – one joule per
second

30. THE ELECTRON SHUFFLE
Turn to page 818 in the textbook.
Read the directions

31. WRITE IN YOUR NOTEBOOK
TITLE: MODELLING A CIRCUIT
1. Draw a diagram of the electron shuffle
in your notebook. Don’t make it small.
Take up half a page
2. Using the words below, label the circle,
the person with the pretzel bowl, the
kids with the pretzel, the kids without
the pretzel, the handshaking kid and the
pretzel itself.
The Battery: 1volt = 1 joule
The Light bulb receiving one volt through one
amp of current
One coulomb of charge with one joule of
energy (1 volt)
One coulomb of charge with no energy
One volt = one joule of energy
Simple circuit

32. DESCRIBE WHAT HAPPENED WHEN:
Round 1: When the battery stopped giving pretzels to the
coulombs of charges, …
Round 2: When the battery gave pretzels to the coulombs of
charges, …
Round 3: When the battery gave three pretzels to each charge, …
Round 4: When the current became two amps per second (the
current speed doubles), …

33. SC.912.P.10.15 - investigate and explain the
relationships among current, voltage, resistance, and
power.
Unit Scale:
4 I can generate and test ways in which
Ohm’s law can help an electrician build
more energy efficient homes.
3 I can explain the relationships among
current, voltage, resistance, and power.
2 I can compare the differences between
current and voltage.
Agenda: Intro to Electricity Mini-Cornell Notes

34. BELLWORK:
Give an example of reflection, refraction and scattering light