\mathrm{EMF}=\frac{\mathrm{W}}{\mathrm{Q}}
\mathrm{V}_{1}-\mathrm{V}_{2}=\frac{\mathrm{W}}{\mathrm{Q}}
\mathrm{I}=\frac{\mathrm{Q}}{\mathrm{t}}
Statement: At constant temperature, the current through an ohmic conductor is directly proportional to the potential difference across it.
\mathrm{V}=\mathrm{I}\mathrm{R}
V = E − I × r
\mathrm{R}=\frac{\mathrm{\rho}\mathrm{l}}{\mathrm{A}}
\mathrm{\sigma}=\frac{1}{\mathrm{\rho}}=\frac{\mathrm{l}}{\mathrm{R}\mathrm{A}}
R = R₁ + R₂ + R₃
\frac{1}{\mathrm{R}}=\frac{1}{\mathrm{R_1}}+\frac{1}{\mathrm{R_2}}+\frac{1}{\mathrm{R_3}}
\mathrm{I}=\frac{\mathrm{nE}}{\mathrm{R}+\mathrm{n}\mathrm{r}}
\mathrm{I}=\frac{\mathrm{nE}}{\mathrm{nR}+\mathrm{r}}
Statement: The heat produced by an electric current is directly proportional to the square of the current, the resistance, and the time.
\mathrm{H}=\mathrm{I}^{2}\mathrm{R}\mathrm{t}
\mathrm{W}=\mathrm{VIt}=\mathrm{I}^{2}\mathrm{R}\mathrm{t}=\frac{\mathrm{V}^{2}\mathrm{t}}{\mathrm{R}}
Average power (P) = \large\displaystyle \frac{\mathrm{W}}{\mathrm{t}}
P = V × I
W = V × Q