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Physics GCSE > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is the equation that links Energy,Charge and Voltage

A

Energy (J) = Charge (C) * Voltage (V)

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2
Q

What is the equation that links Energy,Power and Time

A

Energy (J) = Power (W) * Time (S)

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3
Q

What is the Equation that links Power,Voltage and current

A

Power (W) = Voltage (V) * Current (A)

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4
Q

What is the equation that links Power,Current and Resistance

A

Power (W) = Current² (A) * Resistance (Ω)

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5
Q

What is the equation that links Charge,Current and Time

A

Charge (C) = Current (A) * Time (s)

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6
Q

What is the equation that links Voltage,Current and Resistance

A

Voltage (V) = Current (A) * Resistance (Ω)

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7
Q

What is the equation for Efficiency

A

Efficiency = Useful Power
——————— * 100
Total Input Power

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8
Q

What is current

A

rate of flow of charge

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9
Q

What is unit for Charge

A

Coulombs (C)

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10
Q

Define Voltage

A

Potential Difference- Energy transferred per unit charge

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11
Q

What is voltage always proportional to in series

A

Voltage is always proportional to the current when resistance is contsant (temp. remains constant)

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12
Q

What stays the same in series

A

Same current goes through the cell and resistors in circuit. I Cell. IR = IR2

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13
Q

What is shared between resistors in series

A

Voltage is shared between resistors. Vcell = VR1 + VR2

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14
Q

How is current calculated in series

A

Current = Total Voltage / Total Resistance

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15
Q

How is proportionate share of voltage calculated in series

A

Resistance of compound/total resistance = proportionate share of voltage

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16
Q

What stays the same in parallel circuits

A

Voltage stays the same. Vcell = V1 + V2

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17
Q

What happens to current in parallel circuits

A

Current splits in parallel circuits so I0 = I1 + i2

18
Q

How is current calculated

A

I1 = Vcell/R1

19
Q

What is the relationship between resistance and light in a LDR

A

Resistance decreases as light intensity increases, non-linear

20
Q

What is the relationship between resistance and temperature in a thermistor

A

Resistance of a thermistor decreases, as temp. increases. Non-Linear

21
Q

What is the quality of an ohmic conductor

A

Current is directly proportional to the voltage running through it

22
Q

Why is current and voltage not proportional in a non-ohmic conductor

A

As voltage inc., current inc. , so temp. inc causing resistance to inc.

23
Q

What is the forward direction of a diode and led

A

——->—- (right is forward). it doesn’t work in the reversal direction

24
Q

What is direct current

A

current in one direction only

25
Q

what is alternating current

A

current repeatedly reverses its direction. UK mains is this

26
Q

In which direction does current flow

A

Positive to negative (anticlockwise)

27
Q

What is the frequency of the UK Mains circuit

A

50Hz

28
Q

What is the peak voltage of the Uk Mains

A

325V

29
Q

What is the average Voltage of the Uk mains

A

230V

30
Q

What is the time period of the Uk mains

A

0.02 s

31
Q

Name three factors that affect the resistance of metals (at a constant temp.)

A
  • Type of Metal
  • Length of Metal (Longer Wire,higher resistance)
  • Thickness of Metal (thinner wire,higher resistance)
32
Q

What material are electrical cables made out of

A

Copper

33
Q

What are the wires encased in

A

plastic as it is an electrical insulator

34
Q

What 3 wires do the cable contain and what colours are each

A
  • Earth = Green/Yellow
  • Live=Brown
  • Neutral=Blue
35
Q

What is the purpose of the Live Wire

A

It contains the AC Current

36
Q

What is the purpose of the Neutral Wire

A

It stays at zero and completes the circuit

37
Q

What is the purpose of the Earth Wire

A

It connects the appliance case to the earth so if an accident occurs a very large current overloads to the earth and blows the fuse

38
Q

What is the purpose of a fuse

A

If the current exceeds the limit the fuse melts and stops the circuit

39
Q

what can only move in static electricity

A

only electrons

40
Q

What can electrons do in conductors

A

electrons can move across the object giving negative charge (induced charge)

41
Q

What can electrons do in insulators

A

electrons can move to one side of the atom

42
Q

How can objects be charged

A

They can be charged by friction

Physics GCSE (5 decks)

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