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Two automobile batteries are connected inparallelto power a wheelchair. If each of the batteries has electromotive force12V and internal resistance r=0.025Ohms, and the the wheelchair motor has resistance R=1Ohms, find the current provided to the motor.

Attempt at solution:

So I have emf=12 V, r = 0.025 ohms, and R = 1 ohms...

I set up the current routes such that

I_{1}+ I_{2}= I_{3}

-I_{1}r_{1}+ emf - I_{3}R = 0

-I_{2}r_{2}+ emf - I_{3}R = 0

Then when solving for I_{3}, I get r(I_{2}- I_{1}) = I_{3}*made one "r" since both are same*

Where have I gone wrong in setting up the equations?

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# Homework Help: Kirchoff's Rules

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