Question

In the circuit in the drawing, which resistor dissipates most power?

All resistors dissipate the same amount of EnErgy

A) 1000? RESISTOR , B) 50/Omga resistor on the left , C) 50? resistor on the right

Answer 1

Power dessipated by resistor (50 oms) on the left side = V²/R = 30*30/50 = 18 watt

Voltage across the 100 oms resistor = [100/(100+50)]* 30 = 20 V

Then, Power dessipated by resistor (100 oms) = 20*20/100 = 4 watt

and voltage across 50oms resistor on the right side = [50/(100+50)]* 30 = 10 V

Power dessipated by resistor (50 oms) on the right side = 10*10/50 = 2 watt

Hence the 50 oms resistor on the left side dessipates the power most.