Question

what would be the reading of ammeter and the voltmeter when key is closed ​

Answer 1

Total resistance = 5+8+12 = 25Ω

Therefore, circuit current => I = V/R = 6/25 A = 0.24A

Voltage across 12Ω => V = IR = 12×6/25 = 72/25V = 2.88A