Electrical Engineering - Series-Parallel Circuits - Discussion
Discussion Forum : Series-Parallel Circuits - General Questions (Q.No. 7)
7.
A certain voltage divider consists of three 1 k
resistors in series. Which of the following load resistors will have the least effect on the output voltage?
resistors in series. Which of the following load resistors will have the least effect on the output voltage?1 M
100 k
1 k
330
Discussion:
40 comments Page 3 of 4.
Sony jony said:
1 decade ago
First of all least effect is not big difference in voltage. I equals V/R resistance increases current decreases if we are using 330 as answer it will get big current and voltage drop will be big but question is least effect. So biggest value is answer so current will be less so voltage drop will be less.
Husain said:
1 decade ago
Here we got R2 = 3kohm = 3000ohm.
Lets take minimum resistor R1 = 1kohm = 1000ohm.
Vout = (R2/R1+R2) Vin.
= (3000/1000+3000)Vin.
= 0.75Vin.
So Vout/Vin = 0.75.
Now for max resistor R1 = 1Mohm = 1000000ohm.
Vout = (R2/R1+R2)Vin.
= (3000/1000000+3000)Vin.
= 0.003Vin.
So Vout/Vin = 0.003.
Lets take minimum resistor R1 = 1kohm = 1000ohm.
Vout = (R2/R1+R2) Vin.
= (3000/1000+3000)Vin.
= 0.75Vin.
So Vout/Vin = 0.75.
Now for max resistor R1 = 1Mohm = 1000000ohm.
Vout = (R2/R1+R2)Vin.
= (3000/1000000+3000)Vin.
= 0.003Vin.
So Vout/Vin = 0.003.
Smita said:
1 decade ago
There is all ready total resistance is 3 kilo-ohm.
If resistance less then least effect on source voltage.
So I think 330 ohm is small resistance so answer is this one.
If resistance less then least effect on source voltage.
So I think 330 ohm is small resistance so answer is this one.
Anu said:
1 decade ago
By ohm's law V=IR.
I=V/R.
SO CURRENT INVERSELY PROPORTIONAL TO THE RESISTANCE.
Hence less will be resistance more is the current flowing so more voltage dropped and low resistance will more effect on output voltages.
I=V/R.
SO CURRENT INVERSELY PROPORTIONAL TO THE RESISTANCE.
Hence less will be resistance more is the current flowing so more voltage dropped and low resistance will more effect on output voltages.
VIPIN KUMAR said:
1 decade ago
As we connect one of the series resistance with load in parallel and we know that parallel of two things results in lesser than lesser thing, but larger the value of load resistance parallel will be nearer to lower resistance. So will affect v less so see largest resistance.
Narasimha said:
1 decade ago
Here voltage divider having the low values of resistors. These can allow the some what of fluctuations when the input voltage is get changes by means when we increase input voltage we will get effected output voltage but we are using high range resistor we get least effected output voltage. That means high range resistor strongly opposes the changes in voltage. Here the change will be the effect.
Prahlad said:
1 decade ago
OHM'S LAW:
I inversely proportional to R
And power loss = I^2R.
When more R, than less I.
And less I than less power loss.
So OUTPUT VOLTAGE is high.
So simple high are than OUTPUT VOLTAGE is high.
I inversely proportional to R
And power loss = I^2R.
When more R, than less I.
And less I than less power loss.
So OUTPUT VOLTAGE is high.
So simple high are than OUTPUT VOLTAGE is high.
Pawan kumar said:
1 decade ago
1*1/1+1 = 2/2 how can possible & same R1*R2=1000*3 possible.
V.p.vignesh said:
1 decade ago
Least effect means voltage will lesson than the previous voltage or greater than the previous voltage.
V.p.vignesh said:
1 decade ago
Can anybody explain difference between least effect and most effect.
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