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Flashcards in P1 Energy Deck (48)
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1

Name 5 ways you can reduce energy loss in your home.

Choose from:

  • loft insulation,
  • cavity wall insulation,
  • double glazing,
  • draught excluders, 
  • silver foil behind radiators.
  • carpet, rugs and underlay

2

Give 2 advantages of using fossil fuels to make electricity.

Advantage 1. Fossil fuels are readily available. Advantage 2. Gas power stations have a short start up time meaning the power station can quickly respond to an increased demand.

3

Name 4 energy resources that are renewable.

Chosse 4 energy resources that are renewable

from biofuel,

wind,

hydro-electricity, 

geothermal,

the tides,

the Sun

and water waves.

4

A crane does 15,000J of work in 30 seconds. What is its power?

Power = work done/time taken

=15,000/30

= 500W

5

Give 2 advantages of using renewable sources to make electricity

This will depend on the renewable source used but in general:

Advantage 1. No carbon dioxide is released so the production of energy does not add to climate change. Advantage 2. renewable sources are or can be continuously replaced and so will never run out.

6

Which colour on a thermogram shows where it is hottest?

White or yellow to red.

7

What will affect how fast a building loses heat energy?

The rate of cooling of a building
is affected by the thickness and thermal conductivity of its walls.

8

Heat energy only flows in which direction?

From hotter objects to colder objects.

9

What is the equation to find gravitational potential energy?

10

If g = 10 m/s2 and someone has a mass of 75kg,

What is their weight?

As weight = mass x gravity

weight = 75 x 10

= 750 N. 

11

Would you want a high or low specific heat capacity for a liquid used to fill a radiator? Why?

You would want a high specific heat capacity for a liquid used to fill a radiator because it would store a lot of energy and cool down slowly.

12

What is specific heat capacity?

The energy needed to raise the temperature of 1 kg of a substance by 1 degree.

13

What is power measured in?

Power is measured in Watts.

1 Watt = 1 Joule per second.

14

Explain how conduction happens in solids.

Particles gain energy and vibrate more. These vibrations are passed on to the next particle, then the next and so on, until the vibrations (heat energy) have passed along the solid.

15

What is a renewable energy resource?

A renewable energy resource is one that is being

(or can be) replenished as it is used

16

What is meant by Power?

Power is a measurement of how quickly work is done. The faster you do work, or transfer energy, the greater your power.

17

If a substance has a high specific heat capacity, what does this tell you about the amount of energy it stores?

Substances with a high specific heat capacity take a lot of energy to heat up, so can store a lot of energy.

18

What is meant by Work Done?

Work Done is the energy transferred when a force acts over a certain distance.

19

What does thermal conductivity mean?

The higher the thermal conductivity of a material the higher the rate of
energy transfer by conduction across the material.

20

If a substance has a high specific heat capacity, what does this tell you about how it heats up?

Substances with a high specific heat capacity take a lot of energy to heat up, so will heat up slowly.

21

What is a thermogram?

A picture where different colours are used to show different temperatures.

22

Describe the energy change of an object accelerated by a constant force

The object will gain speed and so gains kinetic energy.

23

A car has a mass of 1000kg and a speed of 10m/s. What is its kinetic energy?

KE = 1/2 mv2

KE = 1/2 x 1000 x 102

= 50,000J

24

Describe the energy changes in a vehicle slowing down

As the vehicle slows down it loses kinetic energy. This is converted into heat due to friction with the air and the brake blocks and the tyres.

25

(HT) You will be given the equation to calculate the energy in a coiled spring. Can you rearrange this to find the spring constant?

 

The spring constant k =E/ 0.5 x e2

26

Name 4 energy resources that are non-renewable.

Oil, coal, gas and nuclear fuels such as Uranium are all non-renewable.

27

What is meant by 'efficiency'?

A measurement of the useful energy output as a percentage of the total energy input.

Eg. a light bulb that converts 50 J of energy into light out of 200 J of electricity supplied would be 25% efficient.

28

If a substance has a high specific heat capacity, what does this tell you about how it cools down?

Substances with a high specific heat capacity store a lot of energy so will cool down slowly.

29

Describe arguments for and against electric cars.

Advantage/ pro/ for: No pollution from vehicle, quiet.

Disadvantage/ anti/ against: shorter range, possible pollution from power station producing electricity for recharging, cost. 

30

Which colour on a thermogram shows where it is coldest?

Black or purple to blue.