P1-Energy

Question 1

What are the four ways which energy is transferred

Answer 1

– Mechanically, electrically, heating, radiation

Question 2

What is Power

Answer 2

The rate of doing work

Question 3

What is the conservation of energy principal

Answer 3

Energy can be transferred usefully, stored or dissipated, but can never be created or destroyed

Question 4

How do you reduce unwonted energy transfers

Answer 4

Lubrication, insolation

Question 5

How do you lubrication reduce friction forces

Answer 5

Lubrication is used to reduce the friction between objects services when they move – it prevents the energy being dissipated

Question 6

How does heating occur

Answer 6

By conduction or convection

Question 7

What is conduction

Answer 7

The transfer of energy when the particles vibrate and collide – transferring between Kinetic energy stores

Question 8

What is convection

Answer 8

When the energy particles move from the hotter to cooler regions

Question 9

What are the ways of preventing energy loss – insolation

Answer 9

Having thick walls are made from material with low thermal conductivity
– Thermal insulation

Question 10

What are the four methods of the thermal insolation

Answer 10

– Cavity walls
– loft insulation
– double glaze windows
– draught excluders

Question 11

What are cavity walls and how do they reduce energy loss

Answer 11

Some houses have cavity walls which are made up of inner and outer wall with an air gap in the middle. But I got reduces the amount of energy transferred by conduction through the walls
– cavity wall insulation is where the cavity wall gap is filled with foam, which can also reduce energy transfer by convection

Question 12

What is Loft installation how to produce energy lost

Answer 12

Love desolation reduces convection current’s (a cycle where air particles are constantly being heated, rising, calling and then sinking)

Question 13

What are double glaze windows and how did they prevent energy transfer

Answer 13

Double glaze windows work in the same way as cavity walls – I have an air gap in the middle between two sheets of glass to prevent energy transfer by conduction

Question 14

How do draught excluder’s work

Answer 14

Draft excluder is around doors and windows reduce energy transfer by convection

Question 15

How do you increase the efficiancy of an intended energy transfer

Answer 15

By insulating objects, lubricating them or making them more streamlined

Question 16

What is a renewable energy source

Answer 16

A resource that is being hall can be replenished as it is used

Question 17

What are the nonrenewable energy sources

Answer 17

Coal, oil, gas

Question 18

What are the renewable energy resources

Answer 18

The sun, wind, water waves, hydro electricity, Abaya fuel, tides, geothermal

Question 19

What are the uses of energy resources

Answer 19

Transport or heating

Heating e.g. radiators,: fireplaces, electric heaters

Transport e.g. petrol diesel used from oil,Coal in steam trains

Question 20

Positives and Negatives of wind power

Answer 20

+ No pollution, there are no fuel and minimal running costs,

– Wind isn’t always available
– they can spoil the view
– they are very noisy
– The initial costs are quite high

Question 21

Advantages and disadvantages of solar cells

Answer 21

Advantages: usually in remote places, no pollution, very reliable,

Disadvantages: not great in cloudy countries, initial costs are high, can’t increase output when his extra demand

Question 22

Advantages and disadvantages of geothermal power

Answer 22

Advantages: it produces a lot of free energy, does Very little damage to the environment,

Disadvantages: There is not many suitable locations for power plants, the cost of power plants is often high

Question 23

Branches and disadvantages of hydroelectric power

Answer 23

Advantages: there are no problems with Liability, no pollution

Disadvantages: loss of habitat, costs,

Question 24

Advantages and disadvantages of wave power

Answer 24

Advantages: no pollution,

Disadvantages: disturbs habitats, spoils you, hazard to boats, fairly unreliable, initial costs are high

Question 25

Tidal barrages Advantages and disadvantages

Answer 25

Advantages: reliable

Disadvantages: habitat, high costs, prevents access to boats

Question 26

What are the environmental problems from fuels

Answer 26

Greenhouse effect, sulphur Darkside – acid rain, landscape, oil spillages,

Question 27

What is the specific heat capacity

Answer 27

The energy required to increase the temperature of 1KG of a substance by 1°

Question 28

What’s the equation for specific heat capacity

Answer 28

Mass X specific heat Capacity X Change in temperature