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Potential Difference (p.d) in an electric circuit is the measurement of energy transfer per unit charge in volts (v) or joules per coulomb (JC^-1). However, in contrast to the Electromotive Force (emf) in a circuit, which is a component that adds charge to the current (usually a cell). p.d uses up the charge to power a component eg a lamp. We would express this as the potential difference across the lamp. We can also say pd (v) = workdone (W)/ charge (Q). because the transfer of energy is the work done and this is per unit of charge.
Example.
What is the pd through a lamp where we have 4 coulombs of charge passing through it and transferring 48 joules of electrical energy into heat and light.
V=W/Q
pd=48/4 =12v
Wiki User
∙ 11y ago
Wiki User
∙ 13y agodifference between voltages at 2 terminals
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