Reversed heat engines (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
How do reversed heat engines operate?
How do reversed heat engines operate?
Work is done on them
In which direction do reversed heat engines move heat?
In which direction do reversed heat engines move heat?
From colder to warmer regions
What does a refrigerator do as a reversed heat engine?
What does a refrigerator do as a reversed heat engine?
Removes heat from cold to warm space
Can the Coefficient of Performance (COP) be greater than 1?
Can the Coefficient of Performance (COP) be greater than 1?
Yes, COP can exceed 1
What is the COP formula for a refrigerator in terms of heat?
What is the COP formula for a refrigerator in terms of heat?
What is the COP formula for a heat pump using temperatures?
What is the COP formula for a heat pump using temperatures?
If a system has a COP of 5, what does this mean?
If a system has a COP of 5, what does this mean?
5 J of heat per 1 J of work
What is the dual functionality of heat pumps?
What is the dual functionality of heat pumps?
Act as refrigerators and heaters
Why are heat pumps more efficient than conventional electric heaters?
Why are heat pumps more efficient than conventional electric heaters?
Transfer >1 J heat per 1 J work
Why must we specify which region heat moves into?
Why must we specify which region heat moves into?
Defines if refrigerator or heat pump