Electrical Engineering - Series Circuits - Discussion
Discussion Forum : Series Circuits - General Questions (Q.No. 5)
5.
Which of the following series combinations dissipates the most power when connected across a 120 V source?
one 220 
resistor
resistortwo 220 resistors
resistorsthree 220 resistors
resistorsfour 220 resistors
resistorsDiscussion:
44 comments Page 5 of 5.
Ponjothirajalingam said:
1 decade ago
But at the same time Power is directly proportional to resistance only.
Sahi said:
1 decade ago
Higher the resistance lower the power dessipation.
Rupesh said:
1 decade ago
What about maximum power transfer theorem? Which says the max power will be transferred to the load when load impedance is equal to the source impedance. It means if load independence is greater than the source impedance then the power transferred to the load is less and vice versa. If we match both the incidences we can get max power and max heat dissipation. So the question is what is the value of source impedance of 120 volt source?
Sriksnth said:
1 decade ago
P = v^2/r.
Power is inversely proportionally to resistance. So, as resistance is less power will be more.
Option A is correct.
Power is inversely proportionally to resistance. So, as resistance is less power will be more.
Option A is correct.
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