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The loss-of-charge method is particularly suitable for measuring medium resistance values. Is this statement true or false?

Difficulty: Easy

Correct Answer: True

Explanation:


Introduction / Context:
The loss-of-charge method is a classical technique for measuring medium resistance values using the discharge of a capacitor through the unknown resistance. It is commonly taught in electrical measurement courses.


Given Data / Assumptions:

  • Principle: capacitor discharges through the resistance to be measured.
  • Voltage across the capacitor decreases exponentially with time.
  • By measuring time for a known voltage drop, resistance can be computed.


Concept / Approach:
The method uses the relation V = V0 e^(-t/RC). Taking logs, R = t / (C ln(V0/V)). Accuracy depends on time measurement and insulation. Suitable resistances are typically 10^5 to 10^7 ohms (medium range).


Step-by-Step Solution:

Charge a capacitor to V0.Connect resistance under test.Measure time for voltage to fall to V.Use relation R = t / (C ln(V0/V)).


Verification / Alternative check:

High resistances → leakage dominates; low resistances → discharge too fast; medium resistances ideal.


Why Other Options Are Wrong:

”False” ignores well-established usage; voltage dependency is not the deciding factor; temperature only affects accuracy slightly.


Common Pitfalls:

Trying to use this method for too high resistances where leakage interferes.


Final Answer:

True
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