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Physics > T - 2 Electricity > Flashcards

T - 2 Electricity Flashcards

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1
Q

Equation for charge?

A

Charge(C) = Current (A) x Time (S)

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2
Q

Equation for potential difference?

A

Potential difference(V) = Current(A) x Resistance(Ω)

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3
Q

What is the trend of current and potential difference in an ohmic conductor?

A

Current is directly proportional to the potential difference

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4
Q

What happens to resistance when current changes in ohmic conductor?

A

resistance remains constant

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5
Q

As the temperature of the filament lamp increases, what happens to the resistance?

A

The resistance of a filament lamp increases

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6
Q

How does the current in a diode flow?

A

Current flows in one direction only

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7
Q

Does a diode have a high or low resistance?

A

The diode has a very high resistance

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8
Q

Which direction does the resistance go in a diode?

A

The reverse direction of current flow.

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9
Q

What are diodes useful for?

A

Controlling flow of current in circuit

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10
Q

What does a LED do when a current flows through?

A

Gives off light

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11
Q

What happens to resistance of an LDR as the light intesnisty increases?

A

The resistance of an LDR decreases

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12
Q

What happens to the resistance of a thermistor when the temperature increases?

A

The resistance of a thermistor decreases

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13
Q

How is the potential difference distributed in series circuit?

A

potential difference is shared between all components

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14
Q

How is current distributed in series circuit?

A

Current is same through each component

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15
Q

How is resistance distributed in a series circuit?

A

Resistance is shared between all components

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16
Q

How is potential difference distributed in a parallel circuit?

A

potential difference is the same across each component

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17
Q

How is current distributed in a parallel circuit?

A

Current is shared between all components

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18
Q

What happens to resistance in parallel circuit when more components are added?

A

The total resistance decreases

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19
Q

What happens when a component breaks in a parallel circuit?

A

The circuit continues

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20
Q

What happens when a component breaks in a series circuit?

A

The circuit stops

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21
Q

What is the direction of a current in an alternating current?

A

current changes direction back and fourth

22
Q

What is the direction of a current in an direct current?

A

Current flows in one direction

23
Q

What current is mains electricity?

A

Alternating current

24
Q

Benefit of using alternating current?

A

Allows to uses a transformer

25
Q

What is the frequency of mains electricity?

A

50hz

26
Q

What power supply is mains electricity?

A

Ac supply

27
Q

What is the potential difference of mains electricity?

A

230 V

28
Q

How are electrical appliances connected to the mains electricity?

A

Three core cable

29
Q

What is the colour of the live wire?

A

brown

30
Q

What is the colour of the neutral wire?

A

blue

31
Q

What is the colour of the earth wire?

A

green and yellow stripes.

32
Q

What does the live wire do?

A

Carries alternating potential difference from the supply

33
Q

What does the neutral wire do?

A

Completes the circuit

34
Q

What does the earth wire do?

A

Stop appliance becoming live

35
Q

What is the potential difference at live wire?

A

230v

36
Q

What is the potential difference at neutral wire?

A

0v

37
Q

What is the potential difference at earth wire?

A

0v

38
Q

Why is the live wire dangerous even when switch is open?

A

The wire still has a high voltage

39
Q

How does the earth wire stop an electric shock? x3

A
  1. Case is attached to earth wire
  2. Earth wire is connected to ground
  3. Fuse melts and shuts off current
40
Q

2 Equations for power in electricity?

A

Power(W) = Potential difference(V) x current(A)
Power(W) = current^2(A) x resistance(Ω)

41
Q

What does the amount of energy an appliance transfers depends on? x2

A

-How long the appliance is switched on for
-The power of the appliance.

42
Q

2 equations for energy transfer?

A

energy transferred = power × time
energy transferred = charge flow × potential difference

43
Q

What is the national grid?

A

A system of transformers and cables

44
Q

What do step up transformers do?

A

Increase potential difference

45
Q

What do step down transformers do?

A

Decrease potential difference

46
Q

Why do step up transformers increase potential difference?

A

To stop energy loss in transmission cables

47
Q

What happens when insulating materials are rubbed against each other?

A

They become electrically charged

48
Q

What happens to electrons when insulating materials are rubbed against each other?

A

Electrons are rubbed off one material and on to the other.

49
Q

What happens when two electrically charged objects are brought together?

A

They exert a force on each other

50
Q

What happens to the force when the distance between the charged objects decrease?

A

The force gets stronger

Physics (6 decks)

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