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B Licence M3 > 3.7 Resistors > Flashcards

3.7 Resistors Flashcards

1
Q

The electrical energy applied to a resistor is converted completely into?

A

Heat

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2
Q

What is the purpose of a potentiometer?

A

Vary the resistance (e.g. the volume control)

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3
Q

What is the purpose of a rheostat?

A

Used for calibration purposes, it can be set to a specific value, using for instance a screwdriver, and then are not touched again.

One example is compass compensation.

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4
Q

How does a voltage dependent resistor work?

A

The resistance value changes according to the applied voltage

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5
Q

How does an increase in voltage affect a voltage dependent resistor?

A

The resistance of a VDR resistor decreases as the voltage increases

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6
Q

What are the two type of temperature dependent resistors?

A

NTC Resistors (negative temperature coefficient)

PTC Resistors (positive temperature coefficient)

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7
Q

How is a NTC Resistor affected by an increase in temperature?

A

Resistance decreases as the temperature increases

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8
Q

How does an increase in temperature affect a PTC resistor?

A

Resistance increases as the temperature increases

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B Licence M3 (20 decks)

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