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An old-style (incandescent) bulb gives light because
Why are LED bulbs said to be energy-efficient compared with incandescent bulbs?
An LED has two legs of unequal length. For the LED to glow in a circuit, its
When an electric room heater is switched on, its coil soon becomes red hot. Explain why, and name the energy change taking place.
Study circuits X and Y. In which circuit will the LED glow? Give a reason.
Look at the circuit. (a) What does the zigzag component R represent? (b) What will you observe if you touch R (carefully) a few minutes after the switch is closed? (c) Name one appliance that uses such a component.
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