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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.
An incandescent bulb and an LED give the same amount of light. After an hour, the incandescent bulb is too hot to touch but the LED is only slightly warm. What does this tell us about which one uses electricity better?
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