Questions
Power dissipated across the resistor in the circuit shown here is 2 W. The power dissipated in watt units across the resistor is
detailed solution
Correct option is D
Resistances 1 Ω and 3 Ω are connected in series, so effective resistanceR'=1+3=4 ΩNow, R' and 8 Ω are in parallel. We know that potential difference across resistances in parallel order is the same.Hence, R'× i1=8i2 or 4 × i1 = 8i2 or i1 = 84 i2 = 2i2or i1 = 2i2 …..(i)Power dissipated across 8 Ω resistance is i22 8t=2 Wor i22 t=28=0.25 W ….(ii)Power dissipated across 3 Ω resistance is H=i12 3t=2i22 3t=12i22 tBut i22 t=0.25 WH=12 × 0.25 = 3 WTalk to our academic expert!
Similar Questions
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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