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May 20 th, 2016
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Physics Test # 1 : Electricity


Test#1

1. Why is the series arrangement not used for domestic circuits?



2. How does the resistance of a wire vary with its area of cross-section?



3. Why are copper and aluminium wires usually employed for electricity transmission?



4. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?



5. Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?



6. Why is the tungsten used almost exclusively for filament of electric lamps?

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