Electric Current

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Electric Current
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Why does electricity flow?
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Electric Potential

• The potential energy per coulomb of charge caused
  by a separation of positive and negative charges
• Energy/charge
• Measured in Volts (V) which is equivalent to a
  joule/coulomb.
• Often referred to as voltage.
• Symbol is V

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Electric Current

• Flow of electric charge
• Charge/time
• Measured in amperes (A)
• 1 A 1 C/sec
• Symbol is I

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Electric Resistance

• Measured in ohms (W)
• Symbol is R
• The more resistance, the less current for the
  same voltage.
• Thinner wire has more resistance, longer wire has
  more resistance.

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Ohms Law
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Voltage or Current?

• High current causes damage, not high voltage.

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Do electrons move far?

• No
• The energy travels fast as electrons bump into
  each other.

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Electric Power
Energy/time