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School Physics notes: (c) Electrical energy & electrostatic electricity energy stores

TYPES OF ENERGY STORE - examples explained

(c) Electrical energy & electrostatic energy stores

 Doc Brown's school physics revision notes: GCSE physics, IGCSE physics, O level physics,  ~US grades 8, 9 and 10 school science courses or equivalent for ~14-16 year old students of physics

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Electrical energy and electrostatic energy stores

  • Electrical energy is usually the flow of electrical charge in the form of negative electrons.

  • When an electrical current flows ('electricity'), the electrons carry the energy from a higher potential energy to a lower potential energy - measured as the potential difference in volts.

  • A battery is a source of electrical energy but it is initially a store of chemical energy.

  • You can of course convert electrical energy to another energy store e.g. charging a battery to increase its chemical potential energy store.

  • Electrical energy can be converted into light with bulbs, thermal energy in heaters, or kinetic energy in electric motors.

  • Electrical energy can be stored as static electricity where electrical charge cannot move until the 'charged' material is placed in contact with an electrical conductor.

  • With electrostatic energy you are dealing with:

    • repulsion of like charges (+ <=> + and - <=> -) ,

    • and the attraction of unlike charges (+ =><= -).

  • Any attraction or repulsion movement of charged objects involves a force acting through a distance, so work is done and energy is transferred.


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Energy resources, energy transfers, work done and electrical power supply revision notes index

Types of energy & stores - examples compared/explained, calculations of mechanical work done and power

Chemical energy stores  * Elastic potential energy stores, calculations  * Electrical & electrostatic energy stores

Gravitational potential energy and calculations  *  Kinetic energy stores and calculations  *  Nuclear energy store

Thermal energy stores  *  Light energy  * Sound energy  * Magnetic energy stores

Conservation of energy, energy transfers-conversions, efficiency - calculations and Sankey diagrams gcse physics

See also More on methods of reducing heat transfer eg in a house, insulating properties of materials

Energy resources: uses, general survey & trends, comparing renewables, non-renewables, generating electricity

Renewable energy (1) Wind power and solar power, advantages and disadvantages gcse physics revision notes

Renewable energy (2) Hydroelectric power and geothermal power, advantages and disadvantages gcse physics

Renewable energy (3) Wave power and tidal barrage power, advantages and disadvantages gcse physics

See also Renewable energy - biomass - biofuels & alternative fuels, hydrogen, biogas, biodiesel gcse chemistry notes

Greenhouse effect, global warming, climate change, carbon footprint from fossil fuel burning gcse chemistry

The absorption and emission of radiation by materials - temperature & surface factors including global warming

The Usefulness of Electricity gcse physics electricity revision notes

and The 'National Grid' power supply, mention of small scale supplies, transformers gcse physics notes


Doc Brown's School Physics Revision Notes

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