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:
0.25 A
2 A
1 A
0.5 A
As we discussed in
Ammeter -
It is a device used to measure current and always connected in series
- wherein
As ammeter is in series with 40.8 Ω
Total resistance of the circuit
R=40.8ΩΩ+19.2Ω
From omni's law
Option 1)
0.25 A
This is incorrect option
Option 2)
2 A
This is incorrect option
Option 3)
1 A
This is incorrect option
Option 4)
0.5 A
This is correct option