Question

# In the circuits shown below the ammeter $$A$$ reads $$4 amp$$ and the voltmeter $$V$$ reads $$20 volts$$. The value of the resistance $$R$$ is

A
Slightly more than 5 ohms
B
Slightly less than 5 ohms
C
Exactly 5 ohms
D
None of the above

Solution

## The correct option is A Slightly more than 5 ohms$$i=i_{1}+i_{2}$$  (Kirchoff Juction Law)$$i_{1}R=V$$   (ohm law)Given $$V=20$$           $$i=4A$$       $$(i-i_{2})R=20$$      $$R=(\dfrac{20}{4-i_{2}})\Omega$$The value of R is slightly more than $$5\Omega.$$Physics

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