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An electric heater that has power of 3600W is used to heat water for 15 minutes. If the cost of 1 unit (kilowatthour) energy consumption is 22 cent, what is the cost of the heating process?
If TNB charges 22 cents for each kWh of electrical energy used, calculate the total cost of using a 3kW electric kettle for 20 minutes and a 100 W filament bulb for 5 hours.
An electric motor raises a mass of 20kg to a height of 5m in 10s. Given that the electric motor is connected to a power source of 40V and current 2A. Find the efficiency of the motor.