Thermistor, LDRs, Diodes and Relays

Which one is the symbol for 'thermistor'?

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Which one is the symbol for 'light dependent resistor'?

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Which one is the symbol for 'light emitting diode'?

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The resistance of a thermistor increases when its temperature increases

• TRUE

• FALSE

When temperature decreases, then the output voltage

• Increases

• Decreases

• Stay the same

The resistance of a light dependent resistor increases when the light intensity decreases

• TRUE

• FALSE

During night, the output voltage is

• Low

• High

In the circuit, the diode is _______________ and current ____________

• forward-biased, flows

• forward-biased, does not flow

• reverse-biased, flows

• reverse-biased, does not flow

A relay switches on or off a high voltage circuit using an external circuit. When the switch in the external circuit is closed, what happens to the solenoid in the external circuit and the switch in the high voltage circuit?