A power supply unit has five output terminals marked A, B, C, D and E, which are at voltage levels - 5, + 5, - 12, + 12, and 0 volts respectively. What is the voltage difference between the terminals B and C? If I had to connect a device that needs supply of 10 volts to operate, which terminals should I connect?
Answers & Comments
i) The voltage difference between terminals B and C is as follows:
Terminal B = + 5
Terminal C = - 12
B - C = = + 5 - ( - 12)
= + 5 + 12
= 17 volts
ii) For a supply of 10 volts =
0 - ( - 5) + 5 = 10
Therefore, it should be connected to terminals E, A, and C.