What is the circuit symbol for a fixed resistor?

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Which electrical component does the above circuit symbol represent?

A fuse.

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What does a light emitting diode (LED) do?

And LED will emit light when current flows through it, and only allow current to flow in one direction.

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What does an ammeter do?

Measure the current in a circuit (or a single loop of a parallel circuit).

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Where should an ammeter be placed? 

In series with the components.

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What does a voltmeter do?

Measures the potential difference (voltage) across a component.

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Where should voltmeters be placed? 

In parallel across the component you're interested in.

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What is a thermistor?

A resistor whose resistance decreases as temperature increases.

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What is a thermistor used for?

To measure the temperature.


For example, in car engines or thermostats.

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What does the resistance-temperature graph for a thermistor look like?

As temperature increases, the resistance of a thermistor decreases.

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What is a light dependent resistor (LDR)?

A resistor whose resistance decreases as light intensity increases.

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What is a light dependent resistor (LDR) used for?

To measure light intensity. 


For example, in automatic night lights.

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What does the resistance-temperature graph for a light-dependent resistor (LDR) look like?

As light intensity increases, the resistance of an LDR decreases.

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What is a variable resistor?

A resistor whose resistance can easily be changed by moving a slider.

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What is a fixed resistor?

A resistor that has a fixed resistance that cannot be changed.


We normally just refer to them as a 'resistor'.

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What is the circuit symbol for a light-emitting diode (LED)?

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What component does the above circuit symbol represent?

A variable resistor.

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What component does the above circuit symbol represent?

A thermistor.

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What is the circuit symbol for a light dependent resistor (LDR)?

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