1(ix)
In a closed circuit containing a bulb and a cell, the electromotive force (ε) and the terminal voltage (V) is related as.
(Given I is current and r is internal resistance.)
- (a)V = ε + Ir
- (b)V = ε – Ir
- (c)V = ε ÷ Ir
- (d)V = ε × Ir
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V = ε – Ir
Reason — : The circuit is :
When current flows,
ε = V + Ir
∴ V = ε – Ir