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Question

A battery of e.m.f. 20V and internal resistance 6Ω is connected to a resistor as shown in figure. If the current in the circuit is 1amp, the resistance of the resistor will be:
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A
14Ω
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B
16Ω
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C
28Ω
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D
7Ω
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Solution

The correct option is B 14Ω
The current running through a resistor when a battery with internal resistance is connected is given as:
I=ER+r

here, E=20 V, r=6 Ω

So, substitue the values:
20R+6=1

20=R+6
R=14Ω

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