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nat 5 physics > Electricity And Energy > Flashcards

Electricity And Energy Flashcards

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1
Q

Give 4 examples of electric fields in use

A

Laser printing
Paint spraying
Cling film
Dust removal

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2
Q

Define electric current

A

Charge passing per unit time

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3
Q

When dc charge moves around a circuit what direction does it move in only one direction?

A

Yes

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4
Q

How does dc charge show on an oscilloscope?

A

Horizontal flat line

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5
Q

Where does dc come from?

A

Batteries

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6
Q

How do ac Charges move

A

Back and forth

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7
Q

is an ac charge alternating?

A

Yes moves from negative to positive them back

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8
Q

What shape does an ac current give on an oscilloscope?

A

A wave

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9
Q

Where does ac come from?

A

Mains supply (50hz)

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10
Q

What effect do resistors have on both current types? (Ac and dc)

A

None

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11
Q

What do capacitors do to dc current?

A

Bring current to zero

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12
Q

What do capacitors do to ac current?

A

Make ac current directly proportional to frequency

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13
Q

What effect do lamps have on ac and dc currents?

A

No effect on either

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14
Q

What will make lamps flash faster?

A

If ac frequency is increased

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15
Q

What do diodes do to dc current

A

To pass in only one direction

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16
Q

What do diodes do to ac current

A

Allow only half to pass

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17
Q

Define work done

A

The amount of energy transferred by potential difference, voltage,

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18
Q

Define potential difference

A

The work done per unit of charge

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19
Q

Define resistance

A

The opposition to electric current

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20
Q

What is an ammeter used to measure

A

The flow of charge

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21
Q

Where must an ammeter be connected to?

A

A series circuit to measure current

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22
Q

What is current measured in?

A

Amperes

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23
Q

What’s a go.gmeter used for?

A

Measuring potential difference

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24
Q

What is voltage measured in

A

Volts

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25
Q

How do you measure the resistance of a component ?

A

With an ohmeter not connected to power

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26
Q

What is resistance measured in ?

A

Ohms

27
Q

What’s the effect of wire material on resistamce

A

Some metals have a greater resistance than others

28
Q

Whats the effect of wire thickness on resistamce

A

Thinner the wire the more resistance

29
Q

Effect of wire length on resistance?

A

Longer wire more resistamce

30
Q

What happens to the voltages in a series circuit?

A

Voltages across all components add up to make voltage supply

31
Q

In series what happens to resistance of each component

A

They add up

32
Q

Give an example of series circuit

A

Old fashioned Christmas tree lights

33
Q

What happens to current in parallel circuits

A

Current from supply splits up between all points

34
Q

What effect does changing resistamce have on electrical current

A

As resistance increases current decrease

35
Q

What effect does the change of resistance have on voltage

A

As resistamce increases so does voltage

36
Q

Define thermistor

A

Temperature dependent resistor

37
Q

What type of device is a thermistor

A

Input

38
Q

As the temperature of a thermistor increases what happens to its resistance

A

Resistance down. Turd

39
Q

Define an LDR

A

Light dependent resistor

40
Q

As LDR irradiance increases what happens to its resistance

A

Goes down. LURD

41
Q

Is an LDR an input or output device

A

Input

42
Q

What’s the function of a solar cell

A

Converts light energy into electrical energy

43
Q

As irradiance on a solar cell increases what happens to its voltage

A

It increases

44
Q

Is a solar cell an input or output device

A

Input

45
Q

What’s the function of a thermocouple

A

Converts heat energy into electrical energy

46
Q

Thermocouple am input or output device

A

Input

47
Q

What is a fuse

A

A safety device

48
Q

If an appliance is rated at less than 700w what type of fuse should be used

A

Three amp

49
Q

If an appliance is greater than 700w what type of fuse should be used

A

13a

50
Q

Define power

A

Energy transferred per unit time

51
Q

Can energy be destroyed

A

No but it can be changed

52
Q

Where does the Kelvin scale cut the axis?

A

-273 degrees

53
Q

How to work out kelvin

A

Celcius + 273

54
Q

What’s it called when an force is used to move an object and energy is used

A

Work energy

55
Q

What is all energy measured in

A

Joules

56
Q

Define specific heat capacity

A

Number of joules of energy required to change the temperature of 1kg of materials by 1 degree

57
Q

Give the effect that similar or opposite charges have on each other

A

Similar repel

Opposites attract

58
Q

What is specific latent heat

A

Amount of heat energy required for a substance to change state

59
Q

What’s it called when a substance changes state from solid to liquid

A

Fusion

60
Q

What’s it called when a substance changes state from liquid to gas

A

Vaporization

61
Q

What happens to temperature when a substance changes state

A

Remains constant

62
Q

Define pressure

A

A force working at right angles to a surface

63
Q

What is 1 pascal equal to

A

I Newton per square meter

64
Q

What three things can change on a fixed mass of gas

A

Pressure
Volume
Temperature

nat 5 physics (2 decks)

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