Energy Stores and Transfers

Question 1

What is the law of conservation of energy?

Answer 1

Energy cannot be created or destroyed, but it can only change form.

Question 2

What are the 8 energy stores?

Answer 2

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

Question 3

Define energy input

Answer 3

The amount of energy put into a device

Question 4

Define energy output

Answer 4

The amount of energy that comes out of a device

Question 5

Define wasted energy

Answer 5

Energy produced by a device that isn’t put towards the intended use

Question 6

Define conduction, give an example

Answer 6

The process of heat transfer for solids. e.g. Your hand touches a hot coffee mug and your hand gets hot

Question 7

Define convection, give an example

Answer 7

The process of heat transfer for fluids. e.g. You turn on a kettle and the water getting heated up rises because hot fluids rise. The colder fluid in the kettle would then gather at the bottom starting a cycle called a convection current.

Question 8

Define radiation

Answer 8

Radiation is energy that moves from one place to another in the form of particles/waves.

Question 9

Define an emitter

Answer 9

An object (usually white) that reflects radiation

Question 9

Define an absorber

Answer 9

An object (usually black) that does not reflect radiation

Question 10

Define an insulator

Answer 10

A material or an object that does not easily allow heat, electricity, light, or sound to pass through it.

Question 11

Explain how heat is conserved in houses/vacuum flasks

Answer 11

Heat can be conserved in houses by taking certain precautions. These include building double layered walls with insulative materials sandwiched in between, stuffing attics with insulative materials so that the rising hot air doesn’t escape, etc. A similar thing is used in vacuum flasks. They’re built with double layered metal that have no air in between. Hence the name vacuum flask.