An overview of electric charges, current, voltage, and resistance- with a little bit of Ohm's Law.

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

8. Some
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Low Voltage

9. Some
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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