Questions
In a circuit shown in fig. the heat produced in 5 ohm resistor due to a current flowing in it is 10 calories per second. The heat produced in 4 ohm resistor is
detailed solution
Correct option is B
Resistance of upper branch, R1 =10ΩResistance of lower branch, R2 = 5 ΩAs they are connected in parallel, hence potential difference across each will be same = VGiven that V24⋅2R2=10cal/sec∴ V2=4⋅2×10×5=210or V=(210) volt Current in 4 Ω resistance=V/R1={(210)/10}Heat produced =i2R/4⋅2cal/sec=210100×44⋅2=2cal/secTalk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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