Q. Two diodes have resistance 20 $\Omega$ and is centretapped with rms secondary voltage from centre tap to each end of secondary 50 V. If external resistance is 980 $\Omega.$ What is mean load?
A) 0.05 A
B) 45 mA
C) 0.25 A
D) 25 mA
Explanation
(b) Maximum load current $I_{m} = \frac{V_{m}}{r_{f} + R_{L}} = \frac{50\sqrt{2}V}{(20 + 980)\Omega}$
= 70.7 mA
$\therefore$ Mean load current. $I_{DC} = \frac{{2I}_{m}}{\pi} = \frac{2 \times 70.7}{\pi} = 45$ mA
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.