Q. 124.4( 45 Votes )

If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
A. 100 %

B. 200 %

C. 300 %

D. 400 %

Answer :

Case 1: power is given by


P1= I2R


Case 2: when current is increased by 100%


It means that current becomes doubled i.e. 2I


Power will be P2 = (2I)2R


i.e. Power = 4 I2R


Change in dissipated power = 4 I2R- I2R =3 I2R


Increase in percent of power dissipated = 3P1/P1 ×100% = 300%

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
What is Electric Current?What is Electric Current?What is Electric Current?56 mins
Understanding Short CircuitUnderstanding Short CircuitUnderstanding Short Circuit38 mins
Ohm's LawOhm's LawOhm's Law43 mins
Factors Affecting ResistanceFactors Affecting ResistanceFactors Affecting Resistance45 mins
Quiz | Most Challenging Questions on ElectricityQuiz | Most Challenging Questions on ElectricityQuiz | Most Challenging Questions on Electricity40 mins
Quiz | Lets Revise ElectricityQuiz | Lets Revise ElectricityQuiz | Lets Revise Electricity27 mins
What is Power Rating?What is Power Rating?What is Power Rating?38 mins
Quiz | Rapid Fire Round (Electricity)Quiz | Rapid Fire Round (Electricity)Quiz | Rapid Fire Round (Electricity)44 mins
Lets Understand Fleming's Left Hand RuleLets Understand Fleming's Left Hand RuleLets Understand Fleming's Left Hand Rule39 mins
Parallel combination of resistorsParallel combination of resistorsParallel combination of resistors36 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses