Question 75Electricity & Electronics - 1st Asst/Chief

70% to pass

Which of the following conditions would most likely lead to the failure of a resistor due to overheating?

AResistor wattage rating one-half that required for the circuit.
BResistor wattage rating four times higher than that required for the circuit.
CResistor wattage rating two times higher than that required for the circuit.
DResistor wattage rating equal to that required for the circuit.
AI Explanation

The correct answer is A) Resistor wattage rating one-half that required for the circuit. This is correct because a resistor with a wattage rating that is only half of what is required for the circuit will likely overheat and fail. The resistor will be unable to dissipate the full amount of heat generated, leading to thermal runaway and potential component failure. The other options are incorrect because a resistor with a higher wattage rating than required (options B and C) will not overheat and fail, and a resistor with a wattage rating equal to the circuit requirement (option D) should be able to handle the load without issue.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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