Electric Charges & Circuits

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Remember: Electric charges come in two varieties.

Negative

Positive &

Opposite charges attract.

Like charges repel.

Like charges repel.

How do we describe electricity?

Voltage The difference in electric potential between 2 points.

How much the electric charges want to move.

or

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High Voltage

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Low Voltage

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Zero Voltage

How do we describe electricity? Voltage

is measured in Volts (V).

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The symbol for Voltage is:

V

How do we describe electricity?

Current How much electricity is flowing

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High Current

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Low Current

The symbol for Current is:

I

Current is measured in Ampères (Amps)

How do we describe electricity?

Resistance How difficult it is for electricity to move through a material.

Low Resistance

High Resistance

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

The symbol for

Resistance is:

R

Resistance is measured in Ohms (Ω)

Ohm’s Law

V=IR Watch:

http://www.youtube.com/watch?v=-mHLvtGjum4