Efficiency, Energy Sources, and Energy Conservation + Power

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Last updated 5:46 PM on 4/12/26
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4 Terms

1
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What is efficiency?

Efficiency is the ratio of energy produced (energy output, or Eout) to the amount of energy used (energy input or Ein), expressed as a percentage

efficiency = (Eout / Ein)100%

2
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What is the general result of efficiency?

  • No device or process is 100% efficient

  • Thermal energy is the most common form of waste energy

3
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What is power?

Power describes the rate at which energy is transformed (or the rate at which work is done) with respect to time

P = ΔE / Δt or P = Wnet / Δt

  • scalar quantity

  • J/s = Watt (W)

4
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What is a power rating?

  • The power rating is the maximum power of an electrical device or appliance.

  • When energy is transformed more quickly, the device is more powerful and the opposite is true

ΔE = PΔt