Emf Electric Power. emf emf: voltage generated by a source (e.g. voltage value labeled on a battery) terminal voltage: the actual potential difference.

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Presentation transcript:

emf Electric Power

emf emf: voltage generated by a source (e.g. voltage value labeled on a battery) terminal voltage: the actual potential difference across the battery’s terminals Compare emf and terminal voltage – for each of the following, determine if it is possible a)emf = terminal voltage b)emf < terminal voltage c)emf > terminal voltage

Mini-Lab: Find Internal Resistance of a Battery 1.Measure emf of the battery 2.Connect the battery to the light bulb a)Measure terminal voltage b)Measure current 3.Determine the potential drop inside the battery 4.Determine the internal resistance of the battery Next: Determine the power dissipated by the light bulb…

Deriving Equation for Electric Power = Rate at which charge carriers do work = Rate at which charge carriers convert EPE to nonelectric energy (Using definition of potential difference) (Using definition of current)

Electric Power

Power Dissipated by a Resistor

Practice a)Calculate the power dissipated by each resistor. b)Calculate the power dissipated by the total circuit.

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