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CBSE Class 11-science Answered

Define the coefficient of performance (COP). Does it have any units?  Explain with the help of a diagram.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

It is defined as the ratio of the amount of heat removed (Q2) from the sink to the work (W) required to do so (figure).

Answered by | 04 Jun, 2014, 03:23: PM

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CBSE 11-science - Physics
Show four steps of carnot engine in P – V graph write the equation of each step and obtain the work done by the system. Also obtain the efficiency of a carnot engine.
Asked by juzarsiddhapurwala | 07 Mar, 2021, 10:08: PM
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CBSE 11-science - Physics
State the conditions which must be fulfilled to utilize heat into useful work.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Can a room be cooled by leaving the door of an electric refrigerator open?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Two ideal heat engines A and B have their sources at 600K and 400K and their sinks at 300K and 250K respectively.  Which engine is more efficient?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Define efficiency of a heat engine.  Also draw the symbolic representation of a heat engine.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
What does a heat engine do? Name two types of heat engines. Give one example of each.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
(a) What is a refrigerator?  Explain its principle by a schematic diagram.  Name the gas commonly used in refrigerators? (b)  In the household refrigerators, name the agency that does the work.  
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Explain the following terms in context with a heat engine: (i)  Hot reservoir (or source) (ii)  Cold reservoir (or sink) (iii)  Working substance (iv)  Mechanical parts
Asked by Topperlearning User | 17 Apr, 2015, 01:47: PM
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CBSE 11-science - Physics
Refrigerator P works between - 10oC and 27oC, while refrigerator Q works between -27oC and 17oC. Both of them remove 2000 J heat from the freezer. Which of the two is a better refrigerator?
Asked by Topperlearning User | 17 Apr, 2015, 01:47: PM
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CBSE 11-science - Physics
In a refrigerator, heat is transferred from inside at 277K to a room at 300K.  How many joules of heat will be delivered to the room for each joule of electric energy consumed ideally?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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