3NT Chapter 4 Electricity Part III

kWh stand for

An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.

A toaster, rated 1500 W 240 V, is switched on for 15 minutes. Calculate the energy used.

Calculate the electrical energy used by bulb X in 2 minutes.

Calculate the power of bulb X.

A space heater plugged into a 120 V outlet carries a current of 12.5 amps. The heater is run for 4 hours. How much energy is used by this heater?

An air conditioner has a power rating of 1200 W. How much energy does it consume in 8 hours?

An air conditioner has a power rating of 1200 W. Assume that each unit costs 24 cents, what is the cost of using the air conditioner for 8 hours?

If you have 26 light bulbs in your home, each 60 watts, how much does it cost to operate them, on average, for 2.5 hours a day, for a month? The cost of electrical energy from the utility company is $0.100496.

How much does it cost to operate a TV for a month if the TV uses 110 V in a 0.33 amp circuit and is operated for 6 hours a day. The cost per kWH is $0.08112