V=20.6 V, R1=9.3 ?, R2=2.9 ?, R3=3.2 ?, R4=4.4 ?. How much will the amount of po

Question

V=20.6 V, R1=9.3 ?, R2=2.9 ?, R3=3.2 ?, R4=4.4 ?.

How much will the amount of power dissipated by R1 change, if resistor R3 is removed?

Your answer should be shown as a positive number if the power dissipated by R1 increases. If the power dissipated by R1 decreases, the answer should be shown as a negative number.

V=20.6 V, R1=9.3 ?, R2=2.9 ?, R3=3.2 ?, R4=4.4 ?. How much will the amount of power dissipated by R1 change, if resistor R3 is removed? Your answer should be shown as a positive number if the power dissipated by R1 increases. If the power dissipated by R1 decreases, the answer should be shown as a negative number.

Explanation / Answer

when R3 is removed total eqv.resistance seen by source=R1+R2+R4=9.3+2.9+4.4=16.6 ohm

I=V/R=20.6/16.6=1.241 A

power dissipated by R4=I2 R1=1.2412 *9.3=14.322 watt

when R3 is present in the circuit,Total Req=(R2//R3)+R1+R4=1.52+9.3+4.4=15.22 ohm

I=V/R=20.6/15.22=1.353 A

P3=1.3532 *9.3=17.0338 watt

hence power consumption decreases by an amount of 2.7118 watt

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