If 24 joules of work is done in moving a charge of 2 coulombs across two points, then what will be the potential difference (voltage) across these two points?

A room heater is rated 400 W, 220 V. If the supply voltage drops to 200 V, what will be the power consumed (approximately)?

A resistor is connected to a battery of 12 V emf and internal resistance 2 Ω. If the current in the circuit is 0.6 A, the terminal voltage of the battery is: