Calculating kWh

• What is a kWh used to measure?

• • A) The color of electricity

• • B) The amount of energy an appliance uses

• • C) The weight of an appliance

• • D) How fast electricity travels

• How many Watts are in a kilowatt?

• • A) 10

• • B) 100

• • C) 1,000

• • D) 10,000

• If a lamp uses 100 Watts and is on for 1 hour, how much energy does it use?

• • A) 0.1 kWh

• • B) 1 kWh

• • C) 10 kWh

• D) 100 kWh

• Which appliance uses more energy?

• A) A 50W bulb used for 3 hours

• • B) A 100W computer used for 1 hour

• C) They use the same

• • D) Cannot be determined

• If you watch TV for 2 hours and it uses 200 Watts, how much energy does it consume?

• A) 0.2 kWh

• B) 0.4 kWh

• C) 2 kWh

• • D) 4 kWh

• What is the purpose of calculating kWh?

• • A) To make the lights brighter

• • B) To measure how much energy we use

• • C) To make appliances work faster

• • D) To cool down the appliances

• If a device has a power rating of 500 Watts and is used for 2 hours, its energy consumption is:

• A) 0.25 kWh

• • B) 1 kWh

• C) 2 kWh

• • D) 1,000 kWh

• Which of these is an example of using energy efficiently?

• A) Leaving the TV on all day

• B) Using a 10W LED bulb instead of a 60W incandescent bulb

• C) Opening the fridge door every 10 minutes

• D) Using a 1500W heater instead of wearing warm clothes

• A 75W fan runs for 10 hours. What is its energy consumption?

• • A) 0.075 kWh

• • B) 0.75 kWh

• C) 7.5 kWh

• • D) 75 kWh

Which uses the least amount of energy?

• A) A 1000W dishwasher running for 1 hour

• B) A 100W light on for 10 hours

• C) Both use the same amount of energy

• • D) Impossible to determine