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Current Electricity Quiz

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Questions and Answers

What characterizes non-ohmic materials in terms of voltage and current relationship?

Their resistance varies with voltage and temperature. (correct)

They maintain a constant resistance regardless of temperature.

They only function at elevated temperatures.

They exhibit a linear voltage relationship.

How does the resistance of a filament lamp change as it gets hotter?

The resistance decreases.

The resistance first decreases, then increases.

The resistance remains constant.

The resistance increases. (correct)

What is the behavior of a thermistor when exposed to increased temperature?

Its conductivity stays unaffected by temperature.

Its resistance increases due to thermal expansion.

Its resistance decreases due to increased electron availability. (correct)

It becomes an insulator as temperature rises.

Which of the following statements about non-ohmic materials is true?

<p>Their voltage-current relationship can change with temperature.</p> Signup and view all the answers

In the context of current conduction, what distinguishes a thermistor from a filament lamp?

<p>A thermistor's resistance decreases with temperature, while a filament lamp's increases.</p> Signup and view all the answers

Study Notes

Current Electricity

Non-ohmic materials exhibit a non-linear voltage relationship.
Filament lamps and thermistors are examples of non-ohmic materials.
Filament resistance increases as the filament gets hotter.
A thermistor's resistance decreases as it gets hotter.
As thermistors heat up, more free electrons become available, leading to increased current flow.

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Description

Test your understanding of current electricity and non-ohmic materials. This quiz covers topics such as filament lamps and thermistors, including their behaviors with changing temperatures. Explore the relationship between voltage and resistance in various materials.