This document provides an overview of key concepts in electricity including electric charges, voltage, current, and resistance. It notes that electric charges come in negative and positive varieties and that opposite charges attract while like charges repel. It defines voltage as the difference in electric potential or how much charges want to move, and notes that voltage is measured in volts. Current is defined as how much electricity is flowing and is measured in amps. Resistance describes how difficult it is for electricity to move through a material and is measured in ohms. Ohm's law relating voltage, current and resistance is also presented.

1. Electric Charges
& Circuits
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2. Remember:
Electric charges come in
two varieties.
Negative
&
Positive

3. Opposite charges attract.

4. Like charges repel.

5. Like charges repel.

6. How do we describe
electricity?
Voltage
The difference in electric
potential between 2 points.
or
How much the electric charges
want to move.

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Tógrafo
High Voltage

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Low Voltage

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Zero Voltage

10. How do we describe
electricity?
Voltage
is measured in Volts (V).
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11. The symbol for Voltage is:
V

12. How do we describe
electricity?
Current
How much electricity is flowing

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High Current

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Low Current

15. The symbol for Current is:
I

16. Current
is measured in Ampères (Amps)

17. How do we describe
electricity?
Resistance
How difficult it is for electricity
to move through a material.

18. Low
Resistance
High
Resistance
Electric fence, via Wikimedia Commons: http://commons.wikimedia.org/wiki/File:XN_Electrical_insulation_Electric_fence_00.jpg

19. The symbol for
Resistance is:
R

20. Resistance
is measured in Ohms (Ω)

21. Ohm’s Law
V=IR Watch:
http://www.youtube.com/watch?v=-mHLvtGjum4