Describe one technique you could use to measure the threshold voltage for LEDs.
A sensitive ammeter is placed in series with LED. With the increase in Voltage, measure the potential difference value when it starts conducting. Black-out and shaded vision tube is used to observe the voltage value when visible light is first observed as the voltage is increased.
MP
Related Physics A Level answers
All answers ▸Give a brief description of the Big Bang and describe its link to cosmic microwave background radiation.
How is a particle moving in circular motion accelerating but not varying speed?
What is a vector?
Describe how the strong nuclear force between nucleons varies with seperation of the nucleons.