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AQA GCSE Physics Weydon > 2. Electricity > Flashcards

2. Electricity Flashcards

1
Q

1. Draw the symbol for a cell.

A
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2
Q
  1. How must an ammeter be placed in a circuit? What is it used to measure?
A
  1. In series, used to measure current
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3
Q
  1. How must a voltmeter be placed in a circuit? What is it used to measure?
A

In parallel, used to measure potential difference

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4
Q
  1. Draw the symbol for a lamp.
A

4

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5
Q
  1. Draw the symbol for a resistor.
A

5

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6
Q
  1. What is difference between series and parallel circuits?
A
  1. Series – all components in one loop. Parallel – components in separate loops.
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7
Q
  1. What are the units for charge?
A
  1. Coulombs (C)
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8
Q
  1. What is current? What are the units for current?
A
  1. Rate of flow of charge, Amps (A)
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9
Q
  1. What is potential difference? What are the units of potential difference?
A
  1. Energy transferred per coulomb of charge, Volts (V)
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10
Q

10.What is resistance? What are the units for resistance?

A
  1. The opposition to the flow of current, Ohms (Ω)
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11
Q

11.Why does increasing temperature increase resistance?

A
  1. Atoms in the wire vibrate more which slows the current down
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12
Q

12.How does current behave in a series circuit?

A
  1. It is the same all round the circuit
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13
Q

13.How does potential difference behave in a series circuit?

A
  1. Potential difference is shared between the components in the circuit
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14
Q

14.How does resistance behave in a series circuit?

A
  1. Total resistance = add up all the resistances in the circuit
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15
Q

15.How does current behave in a parallel circuit?

A
  1. Current is shared between the loops of the circuit
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16
Q

16.How does potential difference behave in a parallel circuit?

A
  1. Potential difference is the same
17
Q

17.How does resistance behave in a parallel circuit?

A
  1. The more loops there are the lower the resistance
18
Q

18.Draw the current-potential different graph for an ohmic resistor.

19
Q

19.Describe the relationship between current and potential difference through a resistor (at a constant temperature)

A
  1. As current increases potential difference increases.
20
Q

20.What is the voltage and frequency of mains electricity in the UK?

A
  1. 230V, 50Hz
21
Q

21.What is the difference between direct current and alternating current (A.C.)?

A
  1. DC goes in one direction, AC rapidly changes direction
22
Q

22.What is the role of a fuse in the plug?

A
  1. The fuse is a thin piece of wire which will melt if the current is too high
23
Q

23.What is the National Grid?

A
  1. A series of cables and transformers to get electricity around the country (from power stations to homes and businesses)
24
Q

24.What do step up and step down transformers do?

A
  1. Step up the voltage to reduce energy loss when electricity goes through the cables. Step down the voltage to make it safe in our homes

AQA GCSE Physics Weydon (4 decks)

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