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WorksheetsEnergy and Efficiency Quiz
Total questions: 15
Worksheet time: 8mins
What happens to energy when it gets used?
It gets created
It gets destroyed
It remains the same
It gets dissipated as waste heat
Which type of energy is useful in a food mixer?
Heat
Sound
Light
Movement
What happens to the sound energy produced by a food mixer?
It remains in the mixer
It gets absorbed by the walls
It gets converted to light
It disappears
What is the efficiency of an old-fashioned filament bulb?
5%
50%
75%
100%
How efficient is an LED bulb?
5%
25%
50%
75%
Why are filament bulbs no longer used?
They are too small
They are too expensive
They are not efficient
They are too bright
How do you calculate efficiency?
Useful energy transferred plus energy supplied
Energy supplied minus useful energy transferred
Energy supplied divided by useful energy transferred times 100
Useful energy transferred divided by energy supplied times 100
What can reduce the transfer of energy to heat?
Adding more energy
Removing insulation
Increasing friction
Lubrication
What can be added to a house to reduce heat loss?
More windows
Insulation
More doors
More lights
What does double glazing do?
Increases sound
Reduces light
Reduces heat loss
Increases heat loss
What is the purpose of draft excluders?
To reduce heat loss
To reduce light
To increase heat loss
To increase sound
What does cavity wall insulation do?
Reduces light
Increases sound
Increases heat loss
Reduces heat loss
What does the height of the box represent in the energy diagram?
Amount of wasted energy
Amount of useful energy
Amount of energy put in
Amount of energy lost
What does the width of the downward boxes represent in the energy diagram?
Amount of wasted energy
Amount of energy put in
Amount of useful energy
Amount of energy lost
What does the infrared image show?
Sound loss from a house
Heat loss from a house
Light loss from a house
Energy gain in a house
