Solved: A certain electronic power supply requires 25 w of input, Electrical Engineering

A certain electronic power supply requires 25 w of input

ELECTRICAL ENGINEERING PRINCIPLES

1) The switch in Fig. 1 has been in position A for a long time. At t = 0, the switch moves to B. Determine v(t) for t > 0 and calculate its value at t = 1 s and 4 s.

741_Circuit fig 1.jpg

2) At t = 0, switch 1 in Fig. 2 is closed, and switch 2 is closed 4 s later. Find i(t) for t > 0. Calculate i for t =2 s and t = 5 s.

1369_Circuit fig 2.jpg

3) A certain electronic power supply requires 25 W of input power. It can produce an output power of 20 W. What is its efficiency, and what is the power loss?

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