Physics-Unit 1

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  • Created by: AVAMKX
  • Created on: 24-05-16 21:07

1. Formula to calculate effieciency

  • Efficiency = useful energy out/total energy in (*100%)
  • Efficiency = total energy in/useful energy out (*100%)
  • Efficiency = [useful energy out*total energy in (*100%)]
  • Efficiency = (useful energy out/total energy in)/100
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2. Which one of the following is not a renewable energy source?

  • Geothermal
  • Oil
  • Solar
  • Wind

3. Why is a high voltage used?

  • The cables cannot transfer low voltage electricity
  • It decreases the amount of energy wasted in cables
  • It increases the amount of energy wasted in cables
  • So they can transfer the electricity at a high current

4. Complete this sentence: Energy can neither be ……….. nor ………….. but it can be transferred.

  • Energy can neither be created nor lost but it can be transferred.
  • Energy can neither be created nor destroyed but it can be transferred.
  • Energy can neither be lost nor destroyed but it can be transferred.

5. Complete this sentence Hotter objects emit ………… infrared radiation than cooler objects

  • Hotter objects emit more infrared radiation than cooler objects.
  • Hot objects do not emit emit infrared at all
  • Hotter objects emit more infrared radiation than cooler objects.
  • Hotter objects emit the same amount of infrared radiation than cooler objects.
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