give reasons for the following
a) alloys are used in electrical heating device rather than pure metal
b) tungsten used in filament of bulb
c) copper and aluminium wires are used in electricity transmission
d) calculate the resistance of electric bulb which allows a 10A current connected to 220Vpower source
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Explanation:
1. Alloys are used in electric heating because they are highly resistive to corrosion, temperature, and heat
2. Since tungsten has high melting and boiling points, and has high resistivity, it is used in filaments of bulbs
3. Since copper and aluminum are good conductors of electricity, they are used in wires for transmitting electricity
4. R= V/I = 220/10 = 22Ω
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