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## Homework Statement

When a current of [tex]2A[/tex] flows the p.d across a battery's terminal falls from [tex]12V[/tex] to [tex]9V[/tex].

(a) What is the value of the loss volt?

(b) What is the internal resistance of the battery?

## Homework Equations

Lost Volt = Ir

## The Attempt at a Solution

(a) [tex]12V - 9V = 3V[/tex]

[tex]R = \frac{V}{I} = \frac{3}{2} = 1.5[/tex]

[tex]Lost Volt = 3 \times 1.5 = 4.5[/tex]

Is this correct?

(b) Don't know which equation to use