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Math Help - circuit questions

  1. #1
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    circuit questions

    heres the pic of whats going on:


    In the circuit B, R eq is the total equivalent resistance seen in circuit A. This means that both the circuit B and A batteries have the same current.

    What resistance should be used for R in circuit A so that R eq will be 100 ohms?

    also, if the battery voltage is 10 volts in circuit A, and the equivalent resistance is 100 ohms, how much power is dissipated by the total resistance in the circuit? and what power is dissipated in each resistor?

    please help me with this.

    thankyou.
    Last edited by CaptainBlack; June 6th 2007 at 05:29 AM.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by rcmango View Post
    heres the pic of whats going on: http://img471.imageshack.us/img471/5418/untitledfj3.png

    In the circuit B, R eq is the total equivalent resistance seen in circuit A. This means that both the circuit B and A batteries have the same current.

    What resistance should be used for R in circuit A so that R eq will be 100 ohms?

    also, if the battery voltage is 10 volts in circuit A, and the equivalent resistance is 100 ohms, how much power is dissipated by the total resistance in the circuit? and what power is dissipated in each resistor?

    please help me with this.

    thankyou.
    I can't get to this right now. I'll try to get to it tonight. (I'm having eye surgery today and my vision will be blurry until tonight.)

    -Dan
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by rcmango View Post
    heres the pic of whats going on:

    The resistance Rp of the 120 Ohm and 60 Ohm resistors in parallel is given by:

    1/ Rp= 1/120 + 1/60

    so Rp=40 Ohm.

    This is in series with a resistor of resistance R, so Req= R + 40 Ohm.

    RonL
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