In the following Figure, R1=0.5 Ohm, R2=0.5 Ohm, and R3=5 Ohm. The current through R2 is 4.00 A. What is the total voltage of the battery (EMF) ? Assume the battery has no internal resistance.

answer: electrons

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r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.