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Flashcards in P1 Energy Deck (24)
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1

List the 8 energy stores?

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

2

What are the pathways that energy can be transferred by?

Heating, Work done by an electric current, work done by a force

3

What are the units for velocity?

m/s

4

What are the units for mass?

kg (kilograms)

5

What are the units for energy?

J (Joules)

6

When will an object have no energy in its kinetic energy store?

When it is not moving

7

When is energy transferred to the gravitational potential energy store?

When an object is lifted up (through a gravitational field)

8

What is the value for gravity on Earth?

9.8 (unless they tell you to use a different number for gravity!)

9

What is the unit for height?

m (metres)

10

When is energy transferred to the elastic potential store?

When an object is stretched or squashed

11

What does the triangle symbol mean?

Change (e.g. change in temperature is ?T)

12

What is specific heat capacity?

Then energy needed to increase the temperature of 1kg of a material by 1?C

13

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

2100J

14

What is power? What is the unit for Power?

Rate of energy transfer, Watts (W)

15

What are the units for work done?

Joules (J) (work done = energy transferred)

16

Why is a system not 100% efficient?

Some energy is always wasted

17

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

5/25 = 0.2 x100 = 20%

18

What happens to waste energy?

Dissipated as heat (spreads out and becomes less useful)

19

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

Cavity wall insulation, loft insulation, double glazing

20

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

Coal, oil, gas, nuclear, wind, hydro-electricity, solar, bio-fuel, tides, geothermal

21

What is a renewable resource?

One that won?t run out - we can replace as fast as we use it.

22

What is finite resource?

One that will run out (non-renewable)

23

Name 3 fossil fuels.

Coal, oil, gas

24

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

ADV: Cheap source of energy, get a lot of energy, reliable DISAD: finite, nuclear waste is dangerous, expensive to decommission