Energy

Question 0

What is the unit of energy

Answer 0

Joule

Question 1

Explain energy

Answer 1

Energy is the ability to do work

Question 2

What is the unit of force

Answer 2

Newton

Question 3

What is the unit of distance

Answer 3

Metres

Question 4

Name a primary source of energy

Answer 4

The sun

Question 5

Name 8 types of energy

Answer 5

Chemical
Electrical
Magnetic
Solar
Light
Nuclear
Heat
Sound

Question 6

What is the formula to find work

Answer 6

Force multiplied by distance

Question 7

When is energy converted into a different form

Answer 7

Whenever work is done

Question 8

Explain power

Answer 8

The rate at which work is done.

Question 9

What is kinetic energy

Answer 9

Moving objects have kinetic energy, example moving car or the waves

Question 10

What is potential energy

Answer 10

Very often when you change the shape or position of an object you give the object potential energy. Like a spring or when you wind up a clock

Question 11

What is sound energy

Answer 11

When you hear somebody talking at the far side of the room, sound energy travels from vocal chords to your ears

Question 12

What is heat energy

Answer 12

Heat energy can cause movement.

When you heat the water in a kettle, some water evaporates into steam. You will see the steam rising upwards. The steam moves. For many years steam engines were used to move many different machines.

Question 13

What is chemical energy

Answer 13

Chemical energy causing movement may not seem obvious at first.
The food we eat contains the chemical energy that we need to move.

Question 14

What is electrical energy

Answer 14

Electrical energy is a good example of a form of energy causing movement.
A hair dryer not only generates heat but also has a motor that blows out the heat as hot air.

Question 15

What is solar energy

Answer 15

Solar energy is taken straight from the rays of the sun. We convert solar energy to electrical energy using solar cells. We also convert solar energy to heat energy using solar panels.
Photosynthesis is an excellent example of solar energy causing movement. Plants grow in size, i.e. they move upwards.

Question 16

What is the equation for power

Answer 16

Work divided by time

Question 17

Name some non renewable sources of energy and what are non renewable sources of energy

Answer 17

Non-renewable sources of energy are sources that will run out, e.g. fossil fuels such as oil, coal, gas and turf.

Question 18

Name some renewable sources of energy and what are renewable sources of energy

Answer 18

They will never run out. Renewable sources of energy include: solar, hydro-electricity, wind, nuclear, geothermal, biomass, tidal and wave.

Question 19

Two advantages to solar energy

Answer 19

Solar energy is free

Solar energy does not cause pollution

Question 20

Name two disadvantages to solar energy

Answer 20

Only a small percentage of the solar energy is converted to electrical energy
Solar cells are expensive to make

Question 21

How can we conserve energy

Answer 21

Better insulation in homes greatly reduces the amount of heat energy lost to the outside.
Switching off electrical devices when not in use will help to reduce energy waste.
Install energy-saving bulbs in the home.
A person buying a car should consider fuel consumption. Not only can this reduce the use of energy, but it is also good for the environment.
Using public transport or travelling to school or work by bicycle helps to reduce the use of energy.

Question 22

Give some examples of energy conversions

Answer 22

When listening to music, electrical energy is converted to sound energy.
When watching television, electrical energy is converted to light energy.
When making toast, electrical energy is converted to heat energy.
When charging our mobile phones, electrical energy is converted to chemical energy.
When using a food mixer, electrical energy is converted to kinetic
energy.
The food we eat is an example of chemical energy changing to kinetic energy when we move. This movement generates heat energy as body temperature rises when we move.

Question 23

Give two advantages of fossil fuels

Answer 23

Can be stored

Relatively cheap

Question 24

Give two disadvantages of fossil fuels

Answer 24

Increases greenhouse effect.

Limited supply of fuel available