What a diode does in a circuit. Half-wave and full-wave rectifiers, the capacitor filter and the ripple, the Zener diode as a voltage regulator, and the LED, the photodiode and the solar cell. It serves the Indian syllabus (NCERT, NEET, JEE Main) and the matching topic of A-Level and IB.
3 lessons, about 1 h 45 min3 simulations12 problems5 practice questionsPython in every lesson
Created by StemPy LabA rectifier turns alternating voltage into a voltage of one sign. A half-wave rectifier uses one diode and gives a mean of . A full-wave rectifier uses two or four diodes and gives , with a ripple at twice the input frequency. A capacitor across the load smooths the output, with a ripple of about .
A Zener diode is made to work in reverse breakdown, where its voltage stays almost fixed at the Zener voltage while the current changes a great deal. Placed across a load with a series resistor, it holds the output at although the input and the load change. The Zener current is .
An LED is a forward-biased junction that gives out a photon of about the band-gap energy when an electron and a hole recombine. A photodiode is a reverse-biased junction whose reverse current grows with the light that falls on it. A solar cell is a junction that gives a voltage and a current to a load when light falls on it, with no battery.
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