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  • A circuit contains an ammeter, a battery of 30v and a resistance 40.8 all connected in series. If the ammeter has

A circuit contains an ammeter, a battery of 30v and a resistance 40.8\Omega all connected in series. If the ammeter has a coil of resistance 480\Omega and a shunt of 20\Omega, the reading in the ammeter will be

Option: 1

0.25A


Option: 2

2A


Option: 3

1A


Option: 4

0.5A


Answers (1)

best_answer

From circuit diagram,

Resistance of ammeter   =\frac{480 \times 20}{480+20}=19.2 \Omega

Total Resistance (R) = 40.8 + 19.2 = 60\Omega

Reading the ammeter i=\frac{V}{R}=\frac{30}{40.8+19.2}=0.5 \mathrm{~A}

 

 

Posted by

Kuldeep Maurya

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