The heating coil of a hot-water heater has a resistance of 20 and operates at 210 V. If electrical energy costs $0.080/kWh, what does it cost to raise 190 kg of water in the tank from 15°C to 89°C?
Nichrome wire of cross-sectional radius 0.786 mm is to be used in winding a heating coil. If the coil must carry a current of 8.00 A when a voltage of 3.00 x 10^2 V is applied across its ends, find the following. The length of wire you must use to wind the coil.
A toaster rated at 1005 W operates on a 120 V household circuit and a 4.00 m length of Nichrome wire as its heating element. The operating temperature of this element is 328°C. What is the cross-sectional area of the wire?