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Science > P5.2 > Flashcards

P5.2 Flashcards

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1
Q

Give three examples of components,what do they resist?

A

Resistors,lamps,motors

They resist the flow of charge through them

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2
Q

The resistance of connecting wires is….

A

So small that it can usually be ignored

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3
Q

Two or more resistors in SERIES have more resistance than either one on its own,
Why?

A

Because the battery has to move charges through both of them

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4
Q

Two (or more) resistors in parallel provide…

What does this mean?

A

More paths for charges to move along that’ll either resistor on its own
• so total resistance is less

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5
Q

Power (watts) =

A

Voltage (volts,v) X current (amperes,A)

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6
Q

Resistors get hotter when there is an…

A

Electric current through them

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7
Q

This heating effect is caused by what?

A

Collisions between the moving charges and stationary ions in the wire

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8
Q

What does this heating effect make?

A

A lamp filament (bulb) hot enough to glow

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9
Q

What happens to the current when you increase the voltage?

A

Increase V, increase current in proportion

Double v,double current

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10
Q

The larger the voltage the ______ the current

A

Bigger

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11
Q

The larger the resistance,the _______ the current

A

Smaller

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12
Q

As light intensity increases, current flowing ________

A

Increases

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13
Q

Light intensity increases,resistance ________

A

Decreases

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14
Q

As the resistance of LDR decreases,light intensity _______

Allowing what to happen?

A

Light intensity increases,allowing more current to flow

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15
Q

When bright,the resistance is ______

What does this make LDR’s useful for?

A

Resistance is high,useful for automatic night lights

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16
Q

When temperature increases,resistance ______ allowing what to happen?

A

Resistance decreases,allowing more current to flow

17
Q

When the temperature is low,the resistance is _______

This makes a thermistor useful for what?

A

Reistance is higher,useful for electronic thermostats

18
Q

Resistance (ohms) =

A

Voltage (C) divided by current (amperes)

19
Q

Fixed resistor

What is it used for?

A

To limit the flow of a current to a particular component

20
Q

LDR

A

Converts light —-> electrical resistance

21
Q

Power is a measure of….

A

A measure of the rate at which an electrical power supply transfers energy to an appliance or device and/or its surroundings

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