Exercise 5.

Watt

Mechanics

Elasticity

Electricity

Exercise 4.

Execise 3.

Exercise 2.

Complete the sentences with the correct form of the words.

1. A motor converts _________energy (the energy source) into kinetic energy (useful energy).

2. If a machine converts a high perscentage of energy into useful energy, it is__________. Efficiency

3. Energy can also be stored when a component is _________ deformed.

4. _______ energy can be stored as potential energy.

5. Power, in watts, is often referred to as _______.

Replace the words in bold with the following words.

1. Machines often convert an energy source, such as electricity, to another form of useful energy.

2. An example of potential energy is a load, lifted by a crane and suspended at high level.

3. In a torch powered by batteries, chemical energy stored in the batteries is convertedto electrical energy.

4. Improving efficiency – making efficiency gains – is a key focus in engineering.

5. If a force of one newton is required to keep an object moving, the work requiredto move that object over a distance of one metre is equal to one joule.

6. The amount of work done is measured in joules.