railway RRB Technician Grade 1 Mock Test 2024 Physics Current, Resistance and Electricity Cells in Series and in Parallel
If an external resistance 20 Ω is connected across two batteries of emfs 4 V and 8 V with internal resistance of 1 Ω each. Find the power dissipated by the 20 Ω resistor:
1
4.2 W
2
3.2 W
3
1.8 W
4
2.8 W