Ham Radio General Class Practice Test

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Boost your ham radio knowledge with our engaging questions and detailed explanations. Prepare effectively with our diverse study resources. Ready to ace the General Class exam?

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Which of the following describes a thermistor?

A resistor that is resistant to changes in value with temperature variations
A device having a specific change in resistance with temperature variations
A special type of transistor for use at very cold temperatures
A capacitor that changes value with temperature

The correct answer is: A device having a specific change in resistance with temperature variations

A thermistor is specifically designed to have a significant change in resistance in response to temperature variations. This characteristic allows thermistors to be used effectively in temperature sensing applications. The resistance of a thermistor decreases with an increase in temperature (for a negative temperature coefficient thermistor) or increases with the increase in temperature (for a positive temperature coefficient thermistor). This ability to sense temperature through a change in resistance makes thermistors highly useful for applications such as temperature measurement, temperature compensation in circuits, and as temperature control devices. The other options do not accurately define a thermistor's function or properties, highlighting why the selected description is the correct one.