Energy and Power Efficiency
Authored by Alexandra Lennon
Physics
10th Grade
Used 2+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula to calculate efficiency?
Efficiency = (Useful output + Total input) / 100
Efficiency = (Useful output - Total input) * 100
Efficiency = (Useful output / Total input) * 100
Efficiency = (Total input / Useful output) * 100
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a machine has an input power of 100W and an output power of 80W, what is its efficiency?
80%
75%
60%
90%
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the efficiency of a machine that requires 500J of energy input to produce 400J of useful work output?
60%
50%
70%
80%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of mechanical power efficiency.
Dividing the output power by the input power and multiplying by 100 to get a percentage.
Dividing the output energy by the input energy and multiplying by 100 to get a percentage.
Dividing the input power by the output power and multiplying by 100 to get a percentage.
Dividing the input energy by the output energy and multiplying by 100 to get a percentage.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of energy efficiency.
Dividing the output power by the input power and multiplying by 100 to get a percentage.
Dividing the output energy by the input energy and multiplying by 100 to get a percentage.
Dividing the input power by the output power and multiplying by 100 to get a percentage.
Dividing the input energy by the output energy and multiplying by 100 to get a percentage.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is efficiency related to energy conservation?
Efficiency reduces the amount of energy required for a task, thus promoting energy conservation.
Efficiency is unrelated to energy usage
Efficiency has no impact on energy conservation
Efficiency increases energy consumption
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the efficiency of a device that consumes 50W of power and produces 40W of useful power.
90%
75%
60%
80%
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