Energy Efficiency
Authored by Rhedita Olivia
Physics, Science
8th Grade
Used 45+ times
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8 questions
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1.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
A new house is fitted with all the latest energy efficiency measures. An energy surveyor checks the
new house and finds that each second the house is losing 125 W of heat through its roof. The
heater in the house is producing around 800 W of heat. How efficient is the heater in percentage?
(round your answer to a whole number)
(a)
2.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
A team of university students test a new car they are designing. They find out that only 3,500 J of the energy is transferred to movement (kinetic) energy and 9,000 J is transferred as heat energy. How efficient is the car?
(note : round your answer to whole number!)
(a)
3.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
A new power station is being constructed and the designers claim that it will be extremely efficient. They claim that for every 1,000,000 Joules of energy, 400,000 Joules of electrical energy will be produced. What is the efficiency of the power station?
(a)
4.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
Calculate the efficiency of an engine that transforms 2000 J of chemical potential energy into 700 J of kinetic energy, and 1300 J into wasted heat and sound energy.
(a)
5.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
Calculate the efficiency of a wind turbine that transforms 800 J of kinetic energy in the wind to 250 J of electrical energy, 350 J of wasted heat and 200 J of sound energy.
(Note : round your answer to whole number)
(a)
6.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
Calculate the efficiency of a torch that transforms 500 J of chemical potential energy into 475 J of light, and 25 J of wasted heat and sound energy.
(Note : round your answer to whole number)
(a)
7.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
Calculate how much energy is transferred as useful energy in a 90% efficient kettle that has a total input power of 1500 J.
(a)
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