- #1

Alouette

- 35

- 0

__Problem__:

Two automobile batteries are connected in

**parallel**to power a wheelchair. If each of the batteries has electromotive force

**12**V and internal resistance r=

**0.025**Ohms, and the the wheelchair motor has resistance R=

**1**Ohms, 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?