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Series Circuits - Engineering

Q1:

If a 6 V and a 9 V source are connected series aiding, the total voltage is

A 6 V

B 9 V

C 3 V

D 15 V

ANS:D - 15 V

From the same transformer which has a secondary output 6/0/6v, if I rectify to get two 6v dc voltage than I make these two different voltages adding in series, will the total voltage be 12v, and can this be applied in practical?