P-N Junction Diode
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?
Show answer and solution
Answer: (d)
- Metal wire and resistor are ohmic, so the reading is the same for both probe directions.
- LED conducts (and glows) only when forward biased, so it deflects in one direction only.
- A capacitor charges through the meter each time the probes are connected, so the needle gives a momentary deflection in both cases before returning.
- Hence 'no deflection in both cases' for a capacitor is not observed.
- So the answer is (d).