02-07 Formulas!

Ohm's Law

Potential drop (V) across a resistive load (R), carrrying current (I):

V = I R

The amount of work done by "water".
Power across a load with potential difference (V), carrying current (I):

P = V I

\begin{array}{rcl} P & = & V I \\ = & I ² R \\ = & \frac{V ²}{R} \end{array}