PDF chapter test TRY NOW
1. Cut an arrow shaped strip from aluminium foil.
2. Ensure that the head is a fine point.
3. Keep the arrow shaped foil on a wooden board.
4. Connect a thin pin to two lengths of wire.
5. Connect the wires to the terminals of electric cell, may be of \(9V\).
6. Press one pin onto the pointed tip and other pin at a point about one or two mm away.
Experimental set-up
Can you see that the tip of aluminium foil starts melting?
Observation:
When the pin is kept at the tip of the arrow, the aluminium foil starts . This melting of the foil shows the . When the flow of current is 'resisted', is generated. It is because electrons encounter as they move through the wire or resistor. Some amount of work must be done to overcome the resistance, which is then transformed into .
Explanation:
This conversion of is known as . This effect forms the basis for all electrical appliances.
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