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  4. A moving-coil ammeter is to be adapted to detect small alternating currents. Which of the following diagrams shows how a diode could be connected in order to make the conversion?

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Q. A moving-coil ammeter is to be adapted to detect small alternating currents. Which of the following diagrams shows how a diode could be connected in order to make the conversion?

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The current must only pass through the meter in the direction $+1$ to $-1$. The diodes in a. and $b$. will not stop the reverse current, so can be eliminated. Remember the reverse diode conducts in the direction in which the triangle of the symbol is pointing.