In the given figure an ammeter A consists of a 240 Ω coil connected in parallel to a 10 Ω shunt. The reading of the ammeter i $s ______$ mA.

Question

In the given figure an ammeter A consists of a 240 Ω coil connected in parallel to a 10 Ω shunt. The reading of the ammeter i s ______ mA.

G1 Physics · Accepted Answer

Image Equivalent resistance of ammeter: R(A) = (240 × 10)/(240 + 10) = 2400/250 = 9.6 Ω This is in series with 140.4 Ω. Total resistance: R(total) = 140.4 + 9.6 = 150 Ω Circuit current: I = 24/150 = 0.16 A = 160 mA