- #1

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The battery has 1.35 V output voltage and 0.15 Ohm internal resistance. The battery is used to boot a small electric motor with 285 Ohm resistance. Find the power delivered to the motor. What the power will be if we use two batteries of this type in series?

3. The Attempt at a Solution

I thought the formula to use was

P

_{L}=V

_{B}

^{2}-(R

_{L}/(R

_{i}+R

_{L})

^{2})

R

_{i}= internal resistance

V

_{B}

^{2}=output voltage

R

_{L}=resistance

When I use this formula my answer is .00639W which is incorrect.

And I'm not sure how to do the second part of the problem

Any help on what I am messing up on would be appreciated.

Thanks