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I/GCSE Physics Question Analysis Topic: Physics - Light
State the I V characteristics of an LED, and state two advantages of LED lamps over conventional incandescent lamps.
Answer:
For I/GCSE Physics, you should know:
Characteristics
Light emitted by an LED changes colour depending on its band gap energy.
Besides, its intensity hinges on the forward current by the p-n junction.
Advantages
1) LEDs have a relatively longer lifespan
2) LEDs are much more efficient than conventional light bulbs, saving up to 90% of energy.
3) LEDs can be physically smaller
4) LEDs have a greater colour rendering index, also known as CRI.
Work hard for your I/GCSE Physics examination!
End of analysis. Great!
