Physics- Energy stores and transfers

Kinetic energy store

Kinetic energy store

Anything moving has energy in its kinetic energy store.

Thermal energy store

Any object. The hotter it is, the more energy it has in this store.You may also see thermal energy stores called internal energy stores.

Chemical energy stores

Anything that can release energy by a chemical reaction, e.g. food and fuels.

Gravitational potential energy store

Anything that has mass and is inside a gravitational field.

Elastic potential energy store

Anything that is stretched (or compressed) e.g. springs

Electrostatic energy store

Anything with electric charge that is interacting with another electric charge,.e.g. two charges that attract or repel each other

Magnetic energy store

Anything magnetic that is interacting with another magnet,.e.g. two magnets that attract or repel each other.

Nuclear energy store

Atomic nuclei have energy in this store that can be released in nuclear reactions

How can energy be transferred mechanically?

An object moving due to a force acting on it,.e.g. pushing, pulling, stretching or squashing.

How can energy be transferred electrically?

A charge(current) moving through a potential difference,e.g. charges moving round a circuit.

How can energy be transferred by heating?

Energy transferred from a hotter object to a colder object,e.g. by heating a pan of water on a hob.

How can energy be transferred by radiation?

Energy transferred by, e.g. light/sound waves

Conservation of energy principle

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

Work done

Can be done by a moving charge or by a force ,owing an object through a displacement.

Kinetic energy store

Gravitational potential energy store

Energy transfer from falling objects

Elastic potential energy store

What is specific heat capacity?

Specific heat capacity equation

Investigating specific heat capacity

1. Measure mass of black.

2. Wrap it in an insulating layer.

3. Insert the thermometer and heater as shown.

4. Measure initial temp of block and set pd of power supply to 10v

5. Turn on power supply and start stop watch.

6. Take readings every 10 mins.

7. Usin measurements of current and pd you can calculate the power.

8. Then plot a graph

9. X- axis- energy transferred

10. Y-axis temperature

What is power?

It is the rate of energy transfer.

What is conduction?

What is convection?

What is thermal conductivity?

It is a measure of how quickly energy is transferred through a material in this way.