Three cells each of e m f 1 5 V and internal re... - JAMB Physics 2007 Question
A
1.5V, 7.50Ω
B
1,5V, 0.83Ω
C
4.5V, 7.50Ω
D
4.5V, 0.83Ω
correct option: b
Since the cells are connected in parallel the net e.m.f is that of one cell, E.
However the effective internal resistance should be added as parallel resistance.
=> 1/v + 1/25 + 1/25 + 1/25 = 1.2
∴ v = 0.83Ω
∴ Effective e.m.f and internal resistance are respectively = 1.5V and 0.83Ω
However the effective internal resistance should be added as parallel resistance.
=> 1/v + 1/25 + 1/25 + 1/25 = 1.2
∴ v = 0.83Ω
∴ Effective e.m.f and internal resistance are respectively = 1.5V and 0.83Ω
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