Activity 3 Compare effects of resistors in series and parallel Individual work


Copy and complete this table to compare effects of resistors in series and parallel circuits.


Number of resistors (bulbs)


1 2 3


Brightness of bulbs Series circuit Parallel circuit


Different metals conduct electricity differently


All metals are conductors of electricity. Some metals are better conductors than others. This difference in conduction is used to provide for our needs. For example: • Copper is a very good conductor. We use copper when making electric cables so that the electricity can be easily conducted.


• The elements of stoves, heaters and toasters are made from nichrome. Nichrome becomes red hot when a current flows through it. This is because nichrome is a resistor and it slows down the current.


• Tungsten is not a very good conductor. We use tungsten in the filament of light bulbs because tungsten resists the current and changes electrical energy into heat and then light.


copper


nichrome


tungsten Figure 4 How well do these metals conduct electricity? 122 Topic 3 Series and parallel circuits


steel


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