The potential difference is the voltage across each component in a circuit
Potential difference is the work done per unit charge
V = IR
v = e.m.f − terminal p.d
v = ε – V = Ir (Ohm’s law)
Typical discharge curves for a 1.5 V terminal cell showing discharge for a 0.5A, 1A and 1.5A drawing current
A lamp is connected to a 240 V mains supply and another to a 12 V car battery.Both lamps have the same current, yet 240 V lamp glows more brightly. Explain in terms of energy transfer why the 240 V lamp is brighter than the 12 V lamp.
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