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 :

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8

1.	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 :
Answer» `1A` 0.5A 0.25A 2A Solution :Equivalent RESISTANCE, `R.=R+(R_(A)XXS)/(R_(A)+S)` = `40.8+(480xx20)/(480+20)` = `40.8+19.2=60.0Omega` `THEREFORE` Current in the circuit, `I=V/(R.)=30/60=0.5A` `therefore` MEASUREMENT of ammeter is 0.5A.

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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 :

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