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Energy

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In order to work, a toaster needs electrical energy.

Energy

Energy is vital for life. In KS3 Science, you’ll learn how food transforms into energy that powers movement, growth, and every process inside your body.

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Fascinating Fact:

When you eat food, your body turns it into energy using chemical reactions, giving your muscles, organs, and brain the power they need to function.

In KS2 Science, students study energy and how it flows through living organisms. Food supplies chemical energy, which is transformed into movement, heat, and other useful forms for life.

Key Terms

  • Energy: The ability to do work or cause change, such as movement, heat, or light.
  • Respiration: The process where cells break down food molecules to release energy.
  • Metabolism: The chemical reactions in the body that sustain life and use energy.

Frequently Asked Questions (Click to see answers)

How does the body turn food into energy?

The body uses a process called respiration, where food molecules like glucose are broken down in cells to release energy for movement, growth, and repair.

Why do we need energy in our bodies?

Energy is needed for everything the body does, from muscle movement and keeping warm to allowing organs like the brain and heart to function properly.

What foods give the body the most energy?

Carbohydrates such as bread, rice, and pasta provide quick energy, while fats and proteins also supply energy but in different amounts and speeds.

Try These Related Quizzes

1 .
Energy is measured in what?
Degrees Celsius
Metres
Grams
Joules
Degrees Celsius measure temperature, metres measure distance and grams measure mass or weight
2 .
Stored energy is called what?
Electrical energy
Potential energy
Kinetic energy
Saved energy
'Potential' means 'possible'. Potential energy can become another form of energy, such as kinetic. A stretched spring would contain potential energy
3 .
What happens to the energy you store in your body?
It disappears
It is used up
It changes into other forms of energy
It is lost
Energy cannot be created or destroyed, but it can change into other forms - this is called the 'Law of Conservation of Energy' - did you know that most of your body's energy is converted to heat?
4 .
Children skipping rope are converting stored energy (from the food they've eaten) into which form of energy?
Potential energy
Light energy
Kinetic energy
Nuclear energy
Kinetic means 'movement'
5 .
Which of these is not an example of kinetic energy?
A moving bicycle
The second hand of a clock moving
Someone rowing a boat
Wood stored in a woodpile
Wood is an example of stored, or potential, energy
6 .
Which of these is not a form of energy?
Kinetic (motion)
Thermal (heat)
Chemical
Power
'Power' is often used as another word for 'energy', but it is not a form of energy. Other forms of energy include: radiant (light), electrical, nuclear and gravitational potential energy
7 .
What do we call fuel sources such as coal, oil and natural gas?
Non-renewable energy sources
Renewable energy sources
Nuclear energy
Radiant energy
Coal, oil and natural gas are all 'fossil fuels' that took millions of years to form under the ground. Because they cannot be easily replaced, they are called 'non-renewable' energy sources
8 .
In order to work, a toaster needs what?
Electrical energy
Chemical energy
Kinetic energy
None of the above
A toaster uses electrical energy, which it converts to heat and light - you use kinetic energy when you put the bread in the toaster and press the lever
9 .
Which of these is not an example of potential energy?
A car at the top of a hill
A beam of light from a torch
A stretched rubber band
A diver on the edge of a diving board
A beam of light is radiant (light) energy
10 .
What do we call electrical energy which comes from sources such as the Sun, the wind or waves?
Non-renewable energy
Renewable energy
Nuclear energy
All of the above
The wind, the waves and the Sun will not run out for billions of years and so they are renewable
You can find more about this topic by visiting BBC Bitesize - What is energy?

Author:  Sheri Smith (PhD English Literature, English Teacher & Quiz Writer)
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