Question

A full wave rectifier uses two diode, the internal resistance if each diode is `20ohm`. The transformer rms secondary voltage from center tap to each end of secondary is 50 V and load resistance is `980Ohm`. Find (i) the mean load current (ii) the rms value of load current.
A. 0.05 A
B. 45 mA
C. 0.25 A
D. 25 mA

Answer 1

Correct Answer - B
Maximum load current, `I_(m)=(V_(m))/(r_(f)+R_(L))`
`=(50sqrt(2)V)/((20+980)Omega)=7.07mA`
`therefore ` Mean load current, `I_(DC) =(2I_(m))/(pi)=(2xx70.7)/(50xx70.7)=45mA`