d
\({{\text{I}}_{\text{m}}}\,\, = \,\,\frac{{{V_m}}}{{{R_f}\,\, + \;{R_L}}}\,\, = \,\,\frac{{25}}{{\left( {10\,\, + \,\,1000} \right)}}\,\, = 24.75\,mA\)

\({I_{dc\,}} = \,\,\frac{{{I_m}}}{\pi }\,\,\frac{{24.75}}{{3.14}}\,\, = \,\,7.88mA\)

\({I_{ms}} = \,\,\frac{{{I_m}}}{2}\,\, = \,\,\frac{{24.75}}{2}\,\, = \,\,12.38mA\)

\(P_{dc} = I_{dc}× R_L = (7.88 × 10^{-3})^2 × 10^3 \approx   62 mW \)

\(P_{dc}  = I_{rms} 2(R_f + R_L) = (12.38 × 10^{-3})^2× (10 + 1000) \approx  155 mW\)

રેક્ટિફિશન  કાર્યક્ષમતા \(\eta \,\, = \,\,\frac{{{{\text{P}}_{{\text{dc}}}}}}{{{{\text{P}}_{ac}}}}\, \times \,\,100\,\, = \,\,\frac{{62}}{{155}}\,\, \times \,\,100\,\, = \,\,40\,\,\% \)