lecture14 - Electrical Work and Power Electrical Electrical...

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Electrical Work and Power Electrical Work and Power
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Electrical Work and Power Electrical Work and Power I I + - Higher V 1 Lower V 2 ResistanceR Current I flows through a potential difference V Follow a chargeQ : at positiveend, U 1 = QV 1 at negativeend, U 2 = QV 2 P.E. Decreases: 0 U Q V = < Thespeed of thecharges is constant in the wires and resistor. What is electrical potential energy converted to?
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Electrical resistanceconverts electrical potential energy to thermal energy (heat), just as friction in mechanical systems converts mechanical energy to heat. This thermal energy means theatoms in the conductor movefaster and so the conductor gets hotter. Theaveragekinetic energy of theelectrons doesn’t increaseonce the current reaches a steady state; theelectrons loseenergy in collisions with the atoms as fast as it is supplied by the field.
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Power dissipated by a resistor: Power dissipated by a resistor: ( ) U Q V P IV t t = = = Power dissipated= current x potential difference Units:
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