- #1

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**1. Homework Statement**

## Homework Equations

P=IV

## The Attempt at a Solution

I used the terminal voltage of battery B, that is I minus the voltage across the internal resistance of battery B from the e.m.f. of battery B, then I multiply it with the current which is 2.5A (calculated earlier) . But it should be just the e.m.f. of battery B multiply the current. Why the e.m.f. and not the terminal p.d.?