Potential difference, work done and charge are related by this equation:
V = W / Q
V=PD in volts, V
W=work done in joules, J
Q=charge in coulombs, C
V = E / Q
E=energy transferred in joules, J
The resistance of a component is calculated using the equation:
R = V / I
R=resistance in ohms
V=PD in volts, V
I=current in amps, A
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