You are designing an experiment for a research project. A very delicate computer

Question

You are designing an experiment for a research project. A very delicate computer sensor requires that it be operated at a voltage of 8 V and a power of 3.0 W. If the wires connecting the experiment to its power source have a total resistance (for all wires) of 0.6 and the power supply has an interenal resistance of 0.7 , what must you design the EMF of the power source to be?

Your answer should be in volts to 3 significant figures. Do not include units in your answer.

The picture is simply an EMF connected with two wires to the computer sensor.

Explanation / Answer

here,

let the EMF required be EMF

power required , P = 3 W

voltage , V = 8 V

then , current required , I = P/V

I = 0.375 A

resistance of the wires , r = 0.6 + 0.7

r = 1.3 ohm

EmF required , EMF = V + I*r

EMF = 8.49 V

the EMF of the power source is 8.49 V

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