A heater coil connected to a 220V has a resistance of 150ohm. How long will it take for this coil to heat 1kg of water from 200Cto600C, assuming that all heat is taken up by water.
An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used:
a) Separately b) In Series c) In Parallel