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. (C)</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. (C)</p> Signup and view all the answers

Flashcards

Non-ohmic material

A material that does not follow Ohm's law, meaning its resistance changes with voltage.

Filament lamp resistance

The resistance of a filament lamp increases as the temperature increases.

Thermistor

A heat-sensitive resistor whose resistance decreases as the temperature increases.

Thermistor resistance change

The resistance of a thermistor decreases as the temperature rises.

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Ohm's law relationship

The relationship where voltage and current in a circuit are directly proportional if the resistance stays the same.

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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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