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LESSON 6

Step 1

List the different ways in which electricity can be generated

Step 2

Answer these questions about a portable generator using your own
knowledge of engineering.
1 What are its main parts?
2 What does the engine run on?
3 What are the four strokes called?
4 What is the function of the crankshaft?
5 What do both stator and rotor have?
6 What is the difference between stator and rotor?

Step 3

Read this text to check as many of the answers as you can. You
will not find complete answers to all of the questions.

PORTABLE GENERATOR

Although most electricity comes from power stations power
can also be generated by far smaller means. Nowadays,
electricity generators can be small enough to hold in the hand.
Portable generators are made up of two main parts: an
engine, which powers the equipment, and an alternator, which
converts motion into electricity.
The engine runs on petrol. It is started by pulling a cord.
This creates a spark inside which ignites the fuel mixture. In a
typical four-stroke engine, when the piston descends, the air inlet
valve opens and a mixture of air and petrol is sucked in through a
carburetor. The valve closes, the piston rises on the compression
stroke and a spark within the upper chamber ignites the mixture.

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