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AQA GCSE Physics Weydon > 1. Energy > Flashcards

1. Energy Flashcards

1
Q

1. List the 8 energy stores?

A

1.Thermal, Kinetic, Gravitational Potential, Elastic potential, Chemical, Magnetic, Electrostatic, Nuclear

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2
Q
  1. What are the pathways that energy can be transferred by?
A
  1. Heating, Work done by an electric current, work done by a force
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3
Q
  1. What are the units for velocity?
A
  1. m/s
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4
Q
  1. What are the units for mass?
A
  1. kg (kilograms)
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5
Q
  1. What are the units for energy?
A
  1. J (Joules)
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6
Q
  1. When will an object have no energy in its kinetic energy store?
A
  1. When it is not moving
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7
Q
  1. When is energy transferred to the gravitational potential energy store?
A
  1. When an object is lifted up (through a gravitational field)
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8
Q
  1. What is the value for gravity on Earth?
A
  1. 9.8 (unless they tell you to use a different number for gravity!)
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9
Q
  1. What is the unit for height?
A
  1. m (metres)
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10
Q

10.When is energy transferred to the elastic potential store?

A
  1. When an object is stretched or squashed
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11
Q

12.What is specific heat capacity?

A
  1. Then energy needed to increase the temperature of 1kg of a material by 1⁰C
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12
Q

13.Specific heat capacity of oil is 2100 J/kg/⁰C. How much energy is needed to raise the temperature of 1kg of oil by 1⁰C?

A
  1. 2100J
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13
Q

14.What is power? What is the unit for Power?

A
  1. Rate of energy transfer, Watts (W)
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14
Q

15.What are the units for work done?

A
  1. Joules (J) – work done = energy transferred
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15
Q

16.Why is a system not 100% efficient?

A
  1. Some energy is always wasted
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16
Q

17.In a light bulb, 25J of energy is supplied. 5J are usefully transferred into light energy. What is the efficiency of the bulb?

A
  1. 5/25 = 0.2 x100 = 20%
17
Q

18.What happens to waste energy?

A
  1. Dissipated as heat (spreads out and becomes less useful)
18
Q

19.Give three examples of insulation that can be used in the house.

A
  1. Cavity wall insulation, loft insulation, double glazing
19
Q

20.What different ways we can get energy (energy resources)?

A
  1. Coal, oil, gas, nuclear, wind, hydro-electricity, solar, bio-fuel, tides, geothermal
20
Q

21.What is a renewable resource?

A
  1. One that won’t run out - we can replace as fast as we use it.
21
Q

22.What is finite resource?

A
  1. One that will run out (non-renewable)
22
Q

23.Name 3 fossil fuels.

A
  1. Coal, oil, gas
23
Q

24.What are the advantages and disadvantages of a nuclear power station?

A
  1. Adv - cheap source of energy, get a lot of energy, reliable
    Disadv - finite, nuclear waste is dangerous, expensive to decommission

AQA GCSE Physics Weydon (4 decks)

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