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

Create a free account to view solution

View Solution Free
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions

More Current Electricity and Electrical Instrument Questions

If E = 200Volt, R = 25Ω, L = 2H and C = 2μF and the frequency is variable then the current at f = 0 and f = &#...A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small l...In the circuit shown in figure -...The current in resistance R at resonance is...The current density in a wire is 10 A/cm2 and the electric field in the wire is 5 V/cm. If ρ = resistivity of mater...