There is no soil in a hole
;)
We can solve the problem by using Ohm's law, which states that an Ohmic conductor the following relationship holds:

where

is the potential difference applied to the resistor
I is the current flowing through it
R is the resistance
In our problem, I=4.00 A and

, so the potential difference is
It's number three on your worksheet. ;)
Your answer is 2.5 x 10^(11).
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