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# What is the resistance?

Sorry English is not my first language. I need help in solving for the resistance of R. What method should I use?

We know...

- that the terminal voltage (?) is 13 V and

- that the current through the resistor of 20 Ohm is 0,35A.

Please help.

### 2 Answers

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- billrussell42Lv 72 months agoFavorite Answer
voltage across R is the same as that across the 20 Ω, E = IR = 20 x 0.35 = 7 volts

voltage across 11 Ω is 13–7 = 6 volts

current thru 11 Ω is 6/11 amps or 0.545 amps

current thru R is 0.545 – 0.35 = 0.195 amps

R = E/I = 7/0.195 = 35.8 Ω

below is easier to read.

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- PhilomelLv 72 months ago
E(20)=I*R=20*.35=7v

E(11)=13-7=6v

I(11)=6/11=.545A

I(x)=.545-.35A=.195A

X=E/I=7/.195= 35.81Ω

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