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Electricity Practical
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copper is a good conductor and thick wires have low resistance

nichrome has a high resistance causing it to heat up without melting

Slide 45

Topic 7 page 35

Topic 7 page 35

3. A variable resistor is used to

4. When the volume on a radio is turned Down

5. Cookers need thick cabling

increase and decrease the current by changing the length of a resistance wire

the resistance wire is lengthened, causing a reduction in the current.

because they use much more current than lamps

Slide 46

Topic 7 page 36

Topic 7 page 36

The purpose of a fuse is

to protect you from a short circuit - safety

Not to make the device work

Slide 47

Circuit Symbols

Circuit Symbols

(components used in slides)

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