Paper 1 - Energy Resources and Energy Transfers

Question 1

What is the equation for Power?

Answer 1

P = W / t

Question 2

What are the 8 energy stores?

Answer 2

• chemical
• kinetic
• gravitational
• elastic
• thermal
• magnetic
• electrostatic
• nuclear

Question 3

What are the 4 energy transfers?

Answer 3

• mechanically
• electrically
• by heating
• by radiation (light and sound)

Question 4

What is the equation for Work Done?

Answer 4

W = F x d

Question 5

What is the equation for kinetic energy?

Answer 5

KE = 1/2 m x v^2

Question 6

What is the principle of conservation of energy?

Answer 6

Energy cannot be created or destroyed it can only be transferred

Question 7

What is the equation for energy efficiency?

Answer 7

efficiency = (useful energy output / total energy input) x 100

Question 8

How could thermal energy transfer take place by conduction due to certain characteristics of an object?

Answer 8

• Thermal energy is transferred from one object to another because metal is a good conductor of heat
• Thermal energy is transferred from an object to the air particles because black is a good emitter of hear

Question 9

How could thermal energy transfer take place by convection?

Answer 9

• Thermal energy is transferred to air
• Hot air is taken up by a fan in a convection current and exits the container to cool down

Question 10

How could thermal energy transfer take place by radiation?

Answer 10

• Electromagnetic energy transfers heat
• A heat source will use electromagnetic waves to transfer energy to the surroundings

Question 11

Explain the role of convection in everyday phenomena

Answer 11

• Heating a of of water in an example
• Bottom the pan heats up because energy is transferred from the heat source to the pot via conduction
• Kinetic energy is transferred to the water molecules at the bottom of the pan which heat up and the rise
• So other water molecules gain kinetic energy
• Creates a convection current

Question 12

Explain how emission and absorption of radiation are related to surface and
temperature

Answer 12

• The colour black is very good at emitting and absorbing heat
• Metal is very good at emitting and absorbing heat

Question 13

Explain ways of reducing unwanted energy transfer

Answer 13

• Insulation to prevent energy from being lost as heat to the surroundings
• Use thicker materials
• Use materials with low thermal conductivity

Question 14

What is work done equal to?

Answer 14

Energy transferred

Question 15

What is the equation for gravitational potential energy?

Answer 15

GPE = m x g h

Question 16

How does conservation of energy produce a link between gravitational
potential energy, kinetic energy and work?

Answer 16

• Work done is equal to the change in kinetic energy or gravitational potential energy.
• If work is done on an object, its KE or GPE will increase.
• If work is done by an object, its KE or GPE will decrease.

Question 17

What is power?

Answer 17

The rate of transfer of energy or the rate of doing work