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 3 of 5.
Krish said:
1 decade ago
Resistor is a device which resists the flow of power through it, The answer will be chosen from the least value of the options simple.
Sadik pasha said:
1 decade ago
In series, number of resistors increase total resistance increase so resistance increase current decrease so power dessipation less.
Dilip said:
1 decade ago
Power = v*2/r.
If r is minimum then power has maximum value.
And we know that i = v/r.
And p = i^2*r directionally proportional.
If r is minimum then power has maximum value.
And we know that i = v/r.
And p = i^2*r directionally proportional.
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.
Hemraj said:
1 decade ago
In this case
P=i^2*r power dissipation is perportional to the ressitace. So more resistace causes of more power dissipation.
P=i^2*r power dissipation is perportional to the ressitace. So more resistace causes of more power dissipation.
Mairaj Alam said:
6 years ago
Keeping voltage constant power is inversely proportional to resistance, so resistance increases power decrease.
(1)
Apiaps said:
10 years ago
v = IR = I = V/R as are reduces I increases.
And P = I^2 *R.
As R reduces I increases as p increases.
And P = I^2 *R.
As R reduces I increases as p increases.
Binay said:
1 decade ago
As p = v^2/r, here v constant, So pr = constant.
So for max p, r should minimum.
So for max p, r should minimum.
Amarnath Maity said:
8 years ago
P = V^2/R.
Choose the lowest total resistance to maximize the dissipation.
Choose the lowest total resistance to maximize the dissipation.
(2)
Ponjothirajalingam said:
1 decade ago
But at the same time Power is directly proportional to resistance only.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers