Question 71Electricity & Electronics - 1st Asst/Chief

70% to pass

If a digital multimeter is set up as shown in figure "A" of the illustration to test a capacitor, what would the display read if the capacitor is functioning properly? Illustration EL-0213

Diagram for USCG Electrical Chief: If a digital multimeter is set up as shown in figure "A" of the illustration to...
Athe ohmic value would read very low and remain at that value
Bthe ohmic value would initially read very low, but over time the ohmic value would gradually rise to an extremely high value (OL ohms)
Cthe ohmic value would initially read very high (OL ohms), but over time the ohmic value would gradually drop to an extremely low value
Dthe ohmic value would read very high (OL ohms) and remain at that value
AI Explanation

The correct answer is B) the ohmic value would initially read very low, but over time the ohmic value would gradually rise to an extremely high value (OL ohms). When a digital multimeter is set up to test a capacitor as shown in figure "A", it is measuring the capacitor's resistance or impedance. A properly functioning capacitor will initially have a very low resistance, as it allows current to flow easily. However, over time, as the capacitor charges, its resistance will gradually increase until it reaches an extremely high value, or "open circuit" (OL ohms), indicating that the capacitor is functioning as expected. The other options are incorrect because: A) The resistance would not remain low, but rather increase over time. C) The resistance would not start high and then decrease, but rather start low and increase. D) The resistance would not remain high, but rather increase to an extremely high value.

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