Question 32
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.
When we use energy-efficient lamps, are we really ‘saving’ energy?
In groups, discuss these questions.
When we use energy-efficient lamps, are we really ‘saving’ energy?
