A straight uniform wire of resistance 36 Ω is bent in the form of a semi-circular loop. The effective resistance between the ends of the diameter of the semi-circular loop is:

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: