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Physics > 2. Electricity (circuit devices, series & parallel circuits) > Flashcards

2. Electricity (circuit devices, series & parallel circuits) Flashcards

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1
Q

What is an LDR dependent on?

A

Light intensity

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2
Q

What happens to an LDR when there is bright light?

A

The resistance is low

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3
Q

What happens to an LDR when it is dark?

A

The resistance is high

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4
Q

What is linked in an LDR?

A

Resistance and voltage, so if one is low the other is too

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5
Q

Where are LDRs found?

A

In automatic night lights and burgalor detectors

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6
Q

What does the graph look like for resistance and light intensity?

A
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7
Q

What is a thermistor and what is it dependent on?

A

It is a temperature dependent resistor

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8
Q

What happens to the thermistor’s resistance in hot condtions?

A

The resistance is low

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9
Q

What happens to the thermistor’s resistance in cold condtions?

A

The resistance is high

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10
Q

What are thermistors used for?

A

Car engines and thermostats

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11
Q

What does the graph look like for resistance and temperature?

A
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12
Q

What can sensing circuits be used for?

A

They can be used to turn on or increase the power to components depending on the conditions that they are in

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13
Q

What are thermistors and LDRs both in?

A

Sensing circuits

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14
Q

How are things arranged in a sensing circuit?

A
  • The thermistor is in series with a fan however the fixed resistor is in parallel with the fan
  • The LDR is in parallel with the bulb and the fixed resistor is in series with the bulb
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15
Q

What happens to the current in series circuits?

A

It is the same throughout

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16
Q

What happens to the current in parallel circuits?

A

The current splits up

17
Q

What is the voltage like in series circuits?

A

It is split up

18
Q

What is the voltage like in parallel circuits?

A

It is the same throughout

19
Q

What is the total potential difference in series circuits?

A

The sum of potential difference for each cell

20
Q

What is the total resistance in series circuits?

A

The sum of all of the components resistances

21
Q

What does adding a resistor in parallel do to the total resistance?

A

It reduces the total resistance

22
Q

What is potential difference?

A

The amount of energy transferred per charge passed

Physics (29 decks)

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