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?

Question

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? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

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.

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?

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.

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?

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.

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.