Energy

Question 1

Identify different forms of energy

Answer 1

Light, heat, sound, gravitational potential energy, kinetic, elastic potential.

Question 2

Describe some energy transformations in…
•A light globe
•A hairdryer

Answer 2

Light globe: electrical energy&raquo_space;> heat & light

Hairdryer: electrical energy&raquo_space;> heat, kinetic, sound,

Question 3

Compare the terms ‘heat’ and ‘temperature’

Answer 3

Heat: Energy that moves from one place to another place that is at a lower temperature.
Temperature: A measure of how hot or cold a substance is. It is measured in degrees Celsius.

Question 4

Outline the essential elements of an electric circuit

Answer 4

• power supply
• Wire
• Lobe
• switch

Question 5

compare conductors and insulators

Answer 5

Conductors: transfer of heat through collisions between particles
Insulators: material that does not allow heat to move through it

Question 6

Define ‘energy’

Answer 6

The ability to make something happen, such as moving something, making a light glow or making a noise.

Question 7

analyse situations in which heat is transferred by one or more of the following: conduction, convection and radiation

Answer 7

Conduction: transfer of heat through collisions between particles eg a hotplate
Convection: transfer of heat through the flow of particles eg heater or Earths mantel
Radiation: a method of heat transfer that does not require particles to transfer heat from one place to another; the energy produced by the nucleus of an atom eg Infra-red

Question 8

Identify that most energy conversions are inefficient and lead to the production of heat

Answer 8

An example is electrical energy hen transformed into light produces a lot of waste heat.
A car engine also produces a lot of waste heat.

Question 9

describe advances in technology that have led to more energy-efficient lighting and cooking appliances

Answer 9

Lighting-From filament light globes that were 95% INEFFICIENT to a compact fluorescent light to LEDs which are 99% EFFICIENT
Kitchen-microwaves instead of cook tops

Question 10

describe solutions to address energy efficiency in house design and construction

Answer 10

Houses have double glazed windows stopping heat getting out and heat getting in, insulation, energy efficient heaters
Construction has lighter and more efficient use of materials and stronger designs.

Question 11

describe the benefits for society and the environment of advances in technology that have led to more efficient lighting, cooking and house design

Answer 11

Reducing electricity which is reducing CO2 emissions, going from society to the environment