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Anonymous
Anonymous asked in Science & MathematicsEngineering · 2 months ago

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.

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2 Answers

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  • 2 months ago
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    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.

    Attachment image
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  • 2 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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