Topic 2 Circuit Devices G***g Flashcards

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1
Q

What is the LDR and what is it dependent on

A

A resistor that is dependent on the intensity of light

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2
Q

When does resistance fall

A

In bright light

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3
Q

When is resistance the highest in. An LDR

A

In darkness

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4
Q

What are LDR resistors used for

A

Automatic night lights, outdoor lighting and burglar detectors

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5
Q

What is a thermistor dependent on

A

Temperature

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6
Q

Hot conditions

A

Resistance drops

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7
Q

Cool conditions

A

Resistance goes up

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8
Q

What are thermistors used as

A

Temperature detectors
E.g car engine
Electronic thermostats

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9
Q

what are sensing circuits used for

A

To turn in or increase the power to components depending on the conditions that they are in

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10
Q

Why will a fan and fixed resistor always have the same potential difference

A

Because they are connected in parallel

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11
Q

The pd Of the power supply is shared out between the thermostat in the loop made up of the fixed resistor and the fan according to what

A

They’re resistances
the bigger a components resistance the more potential difference it takes

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12
Q

As the room gets hotter the resistance of the thermostat decreases and takes a smaller share of the potential difference of the power supply so what happens to the fan

A

The potential difference across the fixed resistor and the fan rises making the fan go faster

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13
Q

Why would a bulb connected in parallel to an LDR get brighter as the room got darker

A

The potential difference across both the LDR and the bulb will be high when it’s dark and the LDLs resistance is high
the greater the potential difference across a component the more energy gets in

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