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 ▸A hot air balloon is travelling at a speed of 5.0m/s at an angle of 60.0 degrees up from the horizontal. Find the vertical and horizontal components.
Define light, critical and heavy damping in simple harmonic motion.
Determine a vector expression for the position of a particle whose velocity is (3t^2 - 8)i + 5j m/s.
Why does an electric drill heat up when passing through metal compared to in thin air?