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ive calculated the current as 0.5A

terminal pd as 1.25V

and calculated the power delivered to the 2.5 ohm resistor.

now i have to calculate the power wasted in the cell?

ive got the equation Ie = I^2 + I^2r

which is the power supplied by the cell = the power delivered to R + the power wasted in the cell.

but im so confused. on rearranging it and subsituting the numbers in?

can anyone shed any light on how i do this? and if so can you give me the equation and talk me through it please..

thanks :)