Power Dissipation in Resistor Consider a resistor in the form of a uniform wire. • Voltage between ends: V ≡ V a-V b = E ( x b-x a ) • Displaced charge: dq = Idt dq I R a b V = V - V b a x a x b E • Work done by electric field ~ E on displaced charge dq : W E = F ( x b-x a
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