Physics-Unit 1

HideShow resource information

1. Formula to calculate effieciency

  • Efficiency = useful energy out/total energy in (*100%)
  • Efficiency = (useful energy out/total energy in)/100
  • Efficiency = total energy in/useful energy out (*100%)
  • Efficiency = [useful energy out*total energy in (*100%)]
1 of 17

Other questions in this quiz

2. What is transferred through the National Grid?

  • Gas
  • Electricity
  • Oil
  • Coal

3. Why do many scientists think adding carbon dioxide to the atmosphere is harmful to the environment?

  • Carbon dioxide causes global warming
  • Carbon dioxide causes global dimming.
  • Carbon dioxide is the main cause of acid rain
  • Carbon dioxide causes visual pollution.

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

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

5. Why is a high voltage used?

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

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Everything in P1 resources »