LEDs Flashcards

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1
Q

What is the purpose of an LED?

A

Used to indicate whether there is a current in a circuit

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2
Q

How does an LED work?

A

It emits light when a current flows through

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3
Q

What happens when light increases in an LDR?

A

The resistance of the LDR decreases

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4
Q

What does a thermistor do?

A

Changed resistance at different temperatures

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5
Q

What happens when there’s a high temperature in a thermistor?

A

Resistance decreases

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6
Q

What happens when there’s a low temperature in a themistor?

A

Resistance increases

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7
Q

Why is a themistor different?

A

It’s a semi conductor

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8
Q

What happens when the themistor heats in terms of electrons?

A

Releases more free charge carriers (electrons) to carry charge and transfer energy to lower resistance

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9
Q

What is an LED?

A

A light emitting diode

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10
Q

Why is an LED a more efficient source of light than a filament lamp?

A

LED wastes less energy than a filament lamp

Useful energy output/total energy input is larger for LED

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