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

Options

A. 0.25 A
B. `2 A`
C. `1 A`
D. 0.5 A

Answer

A

Explanation

`i=30/(40.8 + (480 xx 20)/(480 + 20)) = 0.5 A`