Unit 1 - Physics - Electricity and Circuits.

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State the definition for: Current, Charge, Potential Difference and Resistance.
Current - Flow of electrical charge. Charge - Flow of electrons. Potential Difference - Driving force that pushes charge around circuit. Resistance - Slow charge around circuit.
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Why would you use a potential divider circuit?
For sensor circuits lights to come on automatically.
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How does an electrical conductor conduct electricity?
Free electrons carry the charge throughout.
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How does an increase in temperature affect the conductivity of a semi conductor?
Fewer charge carries available.
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An LDR is a resistor that is dependent on light intensity. What happens to the resistance for the light to be brighter?
Resistance falls.
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An LDR is a resistor that is dependent on light intensity. Where might an LDR be used?
Night lights and burglar detectors.
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A thermistor is a temperature dependent resistor. What happens to the resistance in hot conditions?
The resistance drops.
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A thermistor is a temperature dependent resistor. Where might a thermistor be used?
Car engine temperature sensors and electronic thermistors.
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Other cards in this set

Card 2

Front

Why would you use a potential divider circuit?

Back

For sensor circuits lights to come on automatically.

Card 3

Front

How does an electrical conductor conduct electricity?

Back

Preview of the front of card 3

Card 4

Front

How does an increase in temperature affect the conductivity of a semi conductor?

Back

Preview of the front of card 4

Card 5

Front

An LDR is a resistor that is dependent on light intensity. What happens to the resistance for the light to be brighter?

Back

Preview of the front of card 5
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