What is insulation resistance testing and what unit is used?

Prepare for the Airframe Electrical 1 Test. Use our flashcards and multiple choice questions, each with hints and explanations, to excel in your exam!

Multiple Choice

What is insulation resistance testing and what unit is used?

Explanation:
Insulation resistance testing checks how well insulation blocks leakage by applying a test voltage and measuring the leakage current. The tester pushes a known DC voltage across the insulation and reads how much current leaks, which you translate into resistance using R = V / I. Because insulation in aircraft systems usually has very high resistance, the readings are expressed in megaohms (MΩ). A higher MΩ value means better insulation; a low value signals leakage paths, moisture, or damage. The other units listed measure current (amperes), voltage (volts), or power (watts), not resistance.

Insulation resistance testing checks how well insulation blocks leakage by applying a test voltage and measuring the leakage current. The tester pushes a known DC voltage across the insulation and reads how much current leaks, which you translate into resistance using R = V / I. Because insulation in aircraft systems usually has very high resistance, the readings are expressed in megaohms (MΩ). A higher MΩ value means better insulation; a low value signals leakage paths, moisture, or damage. The other units listed measure current (amperes), voltage (volts), or power (watts), not resistance.

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