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Electronics - Series-Parallel Circuits - Discussion

Discussion Forum : Series-Parallel Circuits - General Questions (Q.No. 8)
Series-Parallel Circuits
8.
With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?
200 mA
800 mA
600 mA
400 mA
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
22 comments Page 2 of 3.
Kamran said:   9 years ago
Thanks @Pankaj.
Lester said:   9 years ago
Not getting, please explain the solution.
Tayyab rehaman said:   8 years ago
Good explanation, Thanks @Pankaj.
(1)
Manish said:   8 years ago
If a series"parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3?

* 45
* 50
* 60
* 90

Please give me the answer.
Damchi said:   8 years ago
Loop1: V =i1(R1+R2) - i2R2.
=> 21=40i1-35i2 ---------1.

Loop2: - i1R1+i2(R2+R3) =0.
=> - 35i1+49i2=0.
=> i1=(49/35)i2=(7/5)i2-------2.

Solving 1 and 2,
i2 = 1 A
i1 = 1.4 A.

Current through R2 = i1-i2
= 0.4 A = 400 mA.
VISHAL said:   7 years ago
Nice explanation @Pankaj.
Gurcharn said:   7 years ago
I think 600 mA.
Red said:   5 years ago
In a circuit, R1 and R2 are connected in series having a resistance of 5 ohms and 10 ohms respectively. The voltage across resistor R1 is equal to 4 V. Find the current passing through R2 and the voltage across the same resistor.

Please help.
Red said:   5 years ago
A parallel circuit has three branches of 6 ohms, 12 ohms, and 20 ohms. If A of current flows through the 12-ohm branch, what is the current flow through the 20-ohm branch?
Red said:   5 years ago
A lamp rated at 120 V, 100 W is to be used on a 220 V line. What size of the resistor should be connected in series with the lamp for correct operation?
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