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Question

A generator has an emf of 420 V and internal resistance of 4000 Ω. Its terminals are connected to a load of 800 Ω. The voltage across the load would be :

A
220 V
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B
70 V
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C
110 V
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D
84 V
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Solution

The correct option is B 70 V
The generator can be thought a cell having emf=420v and internal resistance r=4000Ω
RL= Resistive load
VL= Voltage across resistive road
Apply Voltage division law,
VL=RLReqE Req: Equivalent resistance
Req : r + R_L$ (in series)
=8004800×420 Req=4800Ω

=4206
VL=70v

1061132_1163036_ans_23ed415ba97c492d80a415aa1a4240c5.png

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