In the circuit shown, a current of 0.33 A will pass through which of the following resistors?

R3

R1

R2

R4

R1 ?

jjennylove Apr 22, 2020

#1**+1 **

R1 and R4 and the parallel combo R2 R3 all have the same current through them (I did not calculate it......it will likely be r2 or r3 since you cannot choose multiple )

Can you do it?

ElectricPavlov Apr 22, 2020

#3**+2 **

Alright....this stuff is confusing at first....it will 'click' eventually

Here is one way to do this one

edit:

calculate the entire resistance of the circuit......what do you get ? (19.24 total 7.548 ohms for R2 R3 eqquivalent) Can you do that part?

ElectricPavlov Apr 22, 2020

#6**+2 **

Yes !

Now you can find the current, I , through the circuit I = v / r

current through the circuit = I = 15 v / 19.24 ohm = .7793 Amps

Now R2 and R3 are in parallel their equivalent R = 13 x18 / (13+18) = 7.548 ohms

SO the voltage across them = v = ir (some of the total 15 v is lost across R4 and some is lost across R1)

v = .7793 * 7.548 ohms = 5.88 volts

(this is a lot of stuff) This 5.88 voltas is applied across BOTH R2 and R3 (because they are wired in parallel)

so find the current through EACH one

v = 5.88 r_{2}= 13 ohms r_{3}= 18 ohms

I_{2}= v/r_{2} = 5.88 / 13 = .......

I3 = v/r_{2 }= 5.88 / 18 = ....... One of these is your answer !

ElectricPavlov
Apr 22, 2020

#10**+1 **

Yes....that is the current through the entire circuit . 77 Amps (remember to include units !)

.77 amps goes through r1

and r4 and the combo r2-r3

ElectricPavlov
Apr 22, 2020