Current Electricity and Electrical InstrumentHard

Question

In the circuit shown in figure the heat produced in the 5W resistor due to the current flowing through it is 10cal/s. The heat generated in the 4W resistor is:

Options

A.1 cal/s

B.2 cal/s

C.3 cal/s

D.4 cal/s

Solution

P = I²R ⇒ 10 = i²5 ⇒ i² = = 2 ⇒ i = √2
i₄ = ⇒P4 = 4, P₅ = (i²)5
= 2 cal/s

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