3.1.11

Energy & Power

Test yourself

Power

Power is the rate of energy transfer (or work done). The faster that energy is transferred (or work is done), the higher the power.

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Speakers

  • The more powerful a set of speakers is, the more sound energy will be produced.
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Lightbulbs

  • The more powerful a lightbulb is, the more light energy will be produced.
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Equation for power

  • Power is the rate of energy transfer.
  • We call energy transfer 'work done'.
  • The power (measured in watts) is equal to the work done (in joules) divided by the time taken (in seconds).

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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