Current Electricity and Electrical InstrumentHard

Question

Same length of two identical wires are first connected is series and them in parallel then the amount of heat produced in both the conditions are in the ratio:

Options

A.1 : 4
B.4 : 1
C.3 : 1
D.1 : 2

Solution

       
         
Let the resistance be r for each wire.
Heat generated = I2(2r) = 2I2r
where I is current through both of them. when they are connect in parallel each
will have current = .
Heat generateed = rt × 2 = .
Ratio of heat generated in two case

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