# Electrical Engineering - Parallel Circuits - Discussion

Discussion Forum : Parallel Circuits - General Questions (Q.No. 2)

2.

The total resistance of a parallel circuit is 50 . If the total current is 120 mA, the current through the 270 resistor that makes up part of the parallel circuit is approximately

Discussion:

16 comments Page 1 of 2.
Raguram said:
2 years ago

Whatever may be a count of the resistance in parallel.

That's not important here ...

here, they were given total resistance and total voltage and all the resistance is connected in parallel.

Let's make it simple..voltage across each resistance is the same (because of the parallel circuit)

Total voltage = voltage drop in anyone of the resistance part.

Total current * Total resistance = Individual current* particular resistance value,

50 *120 = x *270.

X = (50 *120)/270.

X ~ 22mA.

That's not important here ...

here, they were given total resistance and total voltage and all the resistance is connected in parallel.

Let's make it simple..voltage across each resistance is the same (because of the parallel circuit)

Total voltage = voltage drop in anyone of the resistance part.

Total current * Total resistance = Individual current* particular resistance value,

50 *120 = x *270.

X = (50 *120)/270.

X ~ 22mA.

(4)

Shiva said:
10 years ago

R1 = 50 ohm.

I1 = 120 mA.

V = I*R(50*120 = 6000 mV).

I2 = V/R2 = 6000/270

= 22.22 mA.

I1 = 120 mA.

V = I*R(50*120 = 6000 mV).

I2 = V/R2 = 6000/270

= 22.22 mA.

(3)

Puja said:
8 years ago

I can't understand. Someone explain me clearly.

(2)

Parampal sehgal said:
1 decade ago

120 ma * 50/270 = 22ma

(1)

ABD said:
9 years ago

I think we can do by ohm's also. In first case we know resistance value and current by this we can find voltage value. In second case we we know resistance value and we already find voltage in first case by using these we can find current.

Ex : Case 1:

V = IR.

V = 50*120 ma.

V = 6 volt.

Case 2:

I = v/r.

I = 6/270.

I = 22 ma.

Let me know this method is correct or not.

Ex : Case 1:

V = IR.

V = 50*120 ma.

V = 6 volt.

Case 2:

I = v/r.

I = 6/270.

I = 22 ma.

Let me know this method is correct or not.

(1)

Raja said:
1 decade ago

According to current div rule.

Current= (total current*total resistance) /particular resistance.

Current= (total current*total resistance) /particular resistance.

Deva said:
1 decade ago

Thanks raja.

Mohana.. said:
1 decade ago

Acc to CDR, current = (particular resistance * total current)/total resistance..

Dilip said:
1 decade ago

Can be explain anybody ?

Ramesh said:
1 decade ago

Total Resistance=50

R1 and R2 are in parallel.

(1/R1)+(1/R2)=(1/50)

R1=270 ohms (given)

R2=61.36

R2=R1/(m-1)

where m=(Total Current/Current through 270 ohms)

Using above formula find out the current through 270 ohms...

R1 and R2 are in parallel.

(1/R1)+(1/R2)=(1/50)

R1=270 ohms (given)

R2=61.36

R2=R1/(m-1)

where m=(Total Current/Current through 270 ohms)

Using above formula find out the current through 270 ohms...

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