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Ohm’s Law

Ohm’s Law. Resistance. Review. Charge (Q) measured in Coulombs (C) Q= 5C Current (I) measured in Amps (A) I = 2A Voltage (V) measured in Volts (V) V = 20V Power (P) measured in Watts (W) P = 1000W. Resistance.

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Ohm’s Law

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  1. Ohm’s Law Resistance

  2. Review • Charge (Q) measured in Coulombs (C) Q= 5C • Current (I) measured in Amps (A) I = 2A • Voltage (V) measured in Volts (V) V = 20V • Power (P) measured in Watts (W) P = 1000W

  3. Resistance • An object’s resistance is a measure of how much it will slow down the flow of electrons. • It resists the current in a wire. • Resistors are things like: Lights, appliances, you…

  4. Resistance • For Resistance: • Variable: R Unit: Ohms (Ω) • R = 10Ω

  5. Ohm’s Law V = IR Voltage = Current * Resistance

  6. Example • According to Ohm’s Law, what is the current in an 8Ω speaker plugged into a 120V outlet?

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