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Physics > T2 P1: Electricity > Flashcards

T2 P1: Electricity Flashcards

1
Q

What does a circuit need for a charge to flow?

A

-Switches Closed
-Potential difference (from a battery or a cell)

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2
Q

What is current?

A

A flow of electrical charge

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3
Q

What equation can current, potential difference and resistance all be calculated in?

A

V= IR

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4
Q

What is potential difference measured in?

A

Volts (v)

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5
Q

What is current measured in?

A

Amperes (A)

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6
Q

What is resistance measured in?

A

Ohms (Omega symbol)

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7
Q

What 5 things can resistance change?

A

Current
Temperature
Light
Length
Voltage

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8
Q

What does a current do in a series circuit?

A

Follows a single path so the current is the same everywhere

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9
Q

What does a current do in a parallel circuit?

A

it splits into multiple paths

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10
Q

What is the frequency of the UK’s Domestic Electric Supply?

A

50Hz

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11
Q

How many volts is the UK’s Domestic Electricity Supply?

A

230 V

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12
Q

What sort of supply is mains electricity?

A

An AC Supply.

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13
Q

What sort of current does AC have?

A

Alternating Current

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14
Q

What sort of current does a DC have?

A

Direct Current (which moves in 1D only)

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15
Q

What are the 3 wires in a plug?

A

Live wire (Brown)
Neutral wire (Blue)
Earth wire (Green and Yellow)

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16
Q

What is the voltage of the Live (Brown) wire?

A

230 V

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17
Q

What is the purpose of the live wire?

A

To carry the alternating potential difference from the supply.

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18
Q

What is the voltage of the neutral (blue) wire?

A

0 V

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19
Q

What is the purpose of the Neutral wire?

A

To complete the circuit

20
Q

What is the voltage of the Earth (yellow and green) wire?

A

0 V, unless there is a fault with the rest of the plug

21
Q

What is the purpose of an Earth Wire?

A

To stop the appliance becoming live.

22
Q

Power is the…

A

… energy transferred per second

23
Q

What is power DIRECTLY proportional to?

A

Current
+
Voltage

24
Q

What is power loss proportional to?

A

Resistance
+
Square of the current

25
Q

What is electric current?

A

The flow (movement) of electric charges.

26
Q

What 2 things does an electric charge need to flow?

A

A source of potential difference and a closed circuit.

27
Q

What is electric current measured in?

A

Amperes (A)

28
Q

True or False: A current has the same value at every point in a single closed loop.

A

True.

29
Q

How do you calculate current?

A

Charge/time

30
Q

What is current?

A

The movement of electrons.

31
Q

What is charge measured in?

A

Coulombs (C)

32
Q

What is an electrical conductor?

A

A material that allows electric currents to pass through it.

33
Q

True or false: all metals are electrical conductors.

A

True

34
Q

What is an electrical insulator?

A

A material that doesn’t allow electric currents to pass through it.

35
Q

Name 2 examples of electrical insulators.

A

Plastic and glass

36
Q

An electric insulator has no…

A

…free electrons

37
Q

An electrical conductor has lots of charges that are…

A

…free to move

38
Q

What charges are free to move in metals?

A

Electrons

39
Q

Is mercury and electrical insulator?

A

No

40
Q

What is potential difference?

A

The difference in the amount of energy that charge carriers have between two points in a circuit.

41
Q

What is potential difference also called?

A

Voltage

42
Q

What is potential difference measured in?

A

Volts

43
Q

What do we use to measure the potential difference?

A

Voltmeter.

44
Q

What does an ammeter?

A

The flow of current that passes through it.

45
Q

What to ammeters have to be connected in?

A

Series (in the same loop of the circuit)

Physics (2 decks)

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