Question 660: Current Electricity

Question

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

Accepted Answer

From circuit diagram
Resistance of ammeter
= $${{480 	imes 20} \over {480 + 20}} = 19.2\Omega $$
Total resistance R = 40.8 + 19.2 = 60$$\Omega$$
Reading in the ammeter $$i = {V \over R}$$
$$ = {{30} \over {40.8 + 19.2}} = 0.5A$$

Answer

2A

Answer

1A

Answer

0.5 A

Answer

0.25 A

Current Electricity

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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