Question 31
Figure 10.12 shows different types of lamps. For incandescent lamps, only about 10% of the energy supplied is transferred and released as light, while the remaining 90% of energy is transferred and released as heat. Compact fluorescent lamps (CFLs) work by passing electricity through gas, causing a coating inside to glow. CFLs and LED lamps are much more efficient. For example, LED lamps can transfer and release up to about 80% of the energy supplied to them as light.
In groups, discuss these questions.
Why do incandescent lamps get very hot when they are switched on?
In groups, discuss these questions.
Why do incandescent lamps get very hot when they are switched on?
