(a) A student wants to use tow p-n junction diodes to convert alternating current in to direct curent draw the labelled circuit diagram she would use and explain how it works
(b) give the truth table and circuit symbol for NAND gate

Explanation

The labeled circuit diagram ,for the required circuit is as shown

The working of this circuits is as follows
(i) During one half cycle (of the input ac) diode ` D_1 ` alone gets forward biased and conducts. During the other half cycle. it is aodel `D_2` (alone ) that conducts.
Because of the use of the center tapped transformer the current though the lead flows in the same direction in both the half cycles. Hence we get a unidirectional /direct current through the load , when the input as altermating current [Altermatively : The student may just use the following diagrams to explain the working.]
` (##DBT_SM_PHY_XII_DL_18_E02_026_S02##) `