Question

h=i²rt and also h=v²t/r. so is heat produced directly or indirectly proportional to resistance.

Answer 1

Dear Student,

$$\begin{gathered} \mathrm{H}={\mathrm{I}}^2\mathrm{Rt} \\ \mathrm{or}\mathrm{H}=\frac{{\mathrm{V}}^2}{\mathrm{R}}\mathrm{t} \\ \left(1\right)\mathrm{when}\mathrm{resistors}\mathrm{are}\mathrm{joined}\mathrm{in}\mathrm{series}\mathrm{then} \\ \mathrm{H}\mathrm{\alpha }\mathrm{R}\mathrm{for}\mathrm{same}\mathrm{I} \\ \left(2\right)\mathrm{When}\mathrm{resistors}\mathrm{are}\mathrm{joined}\mathrm{in}\mathrm{parallel}\mathrm{then} \\ \mathrm{H}\mathrm{\alpha }\frac{1}{\mathrm{R}}\mathrm{for}\mathrm{same}\mathrm{V} \end{gathered}$$