Electrical Engineering - Series Circuits - Discussion
Discussion Forum : Series Circuits - General Questions (Q.No. 4)
4.
A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 
. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is
. If each resistor is operating in the circuit at its maximum power dissipation, total current flow isAnswer: Option
Explanation:
Total P = P1 + P2 + P3 = 7/8w.
P = I2R.
I = sqrt (P/R)
Now, P = 7/8w, R = 1200 ohm.
Therefore,
I= sqrt ( (7/8)/1200 ) = 0.0270030862 = 27 mA.
Discussion:
32 comments Page 2 of 4.
Adil said:
1 decade ago
P = P1+P2+P3.
P = (1/8)+(1/2)+(1/4).
P = (1+2+4) /8.
P = 7/8 W.
& we have P = I^2*R.
Now P =7/8 w & are is given i.e. R = 1200 ohm.
Therefore,
I = sqrt (P/R).
I = sqrt ((7/8)/1200).
I = 27 mA.
P = (1/8)+(1/2)+(1/4).
P = (1+2+4) /8.
P = 7/8 W.
& we have P = I^2*R.
Now P =7/8 w & are is given i.e. R = 1200 ohm.
Therefore,
I = sqrt (P/R).
I = sqrt ((7/8)/1200).
I = 27 mA.
Prince said:
10 years ago
P = P1+P2+P3= 1/8+1/4+1/2= (1+2+4)/8;
P = 7/8.
We know that P = I^2R ; 7/8 = I^2x 1200;
Then, I = sqrt (7/8)/1200 = 0.027003 A = 27.003m A.
P = 7/8.
We know that P = I^2R ; 7/8 = I^2x 1200;
Then, I = sqrt (7/8)/1200 = 0.027003 A = 27.003m A.
Punith said:
10 years ago
How to calculate sqrt (7/8)/1200 without calculator anybody please?
Veena said:
9 years ago
Nice @Punith asked the good question because in competitive examination calculator is not allowed. So anyone will explain how to calculate square roots without calculator?
PAVAN said:
9 years ago
Yes @Punith, same doubt for me.
How to calculate the square root value without a calculator?
How to calculate the square root value without a calculator?
Vishal said:
9 years ago
Same doubt for me also, anybody tell me please.
Rishika said:
9 years ago
I don't know how to calculate in calculator can anyone help us who are having trouble about this, please.
Riya said:
9 years ago
@All.
What does sqrt mean?
What does sqrt mean?
Ankur said:
9 years ago
@Riya.
sqrt means square root.
sqrt means square root.
Jagan said:
9 years ago
Actually, the parallel circuit formula is 1/p.
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