P1 Energy

Question 1

List the 8 energy stores?

Answer 1

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

Question 2

What are the pathways that energy can be transferred by?

Answer 2

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

Question 3

What are the units for velocity?

Answer 3

m/s

Question 4

What are the units for mass?

Answer 4

kg (kilograms)

Question 5

What are the units for energy?

Answer 5

J (Joules)

Question 6

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

Answer 6

When it is not moving

Question 7

When is energy transferred to the gravitational potential energy store?

Answer 7

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

Question 8

What is the value for gravity on Earth?

Answer 8

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

Question 9

What is the unit for height?

Answer 9

m (metres)

Question 10

When is energy transferred to the elastic potential store?

Answer 10

When an object is stretched or squashed

Question 11

What does the triangle symbol mean?

Answer 11

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

Question 12

What is specific heat capacity?

Answer 12

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

Question 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?

Answer 13

2100J

Question 14

What is power? What is the unit for Power?

Answer 14

Rate of energy transfer, Watts (W)

Question 15

What are the units for work done?

Answer 15

Joules (J) (work done = energy transferred)

Question 16

Why is a system not 100% efficient?

Answer 16

Some energy is always wasted

Question 17

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

Answer 17

5/25 = 0.2 x100 = 20%

Question 18

What happens to waste energy?

Answer 18

Dissipated as heat (spreads out and becomes less useful)

Question 19

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

Answer 19

Cavity wall insulation, loft insulation, double glazing

Question 20

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

Answer 20

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

Question 21

What is a renewable resource?

Answer 21

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

Question 22

What is finite resource?

Answer 22

One that will run out (non-renewable)

Question 23

Name 3 fossil fuels.

Answer 23

Coal, oil, gas

Question 24

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

Answer 24

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