Current, Voltage, & Resistance
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Transcript of Current, Voltage, & Resistance
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Electric Charges & Circuits
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Remember: Electric charges come in two varieties.
Negative
Positive &
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Opposite charges attract.
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Like charges repel.
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Like charges repel.
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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
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How do we describe electricity? Voltage
is measured in Volts (V).
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The symbol for Voltage is:
V
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How do we describe electricity?
Current How much electricity is flowing
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High Current
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Low Current
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The symbol for Current is:
I
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Current is measured in Ampères (Amps)
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How do we describe electricity?
Resistance How difficult it is for electricity to move through a material.
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Low Resistance
High Resistance
Electric fence, via Wikimedia Commons: http://commons.wikimedia.org/wiki/File:XN_Electrical_insulation_Electric_fence_00.jpg
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The symbol for
Resistance is:
R
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Resistance is measured in Ohms (Ω)
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Ohm’s Law
V=IR Watch:
http://www.youtube.com/watch?v=-mHLvtGjum4