A closed mesh has a potential \( V' \), current \( I \), and resistance \( R \).
If \( V' = 0.5 \,\text{V} \), \( I = 0.1 \,\text{A} \), and \( R = 20 \,\Omega \),
the total voltage \( V \) is:
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Total voltage is the sum of the source potential and the $IR$ drop.