B. A battery-charging circuit is shown in Fig04a. The forward resistance of the diode can be considered negligible and the reverse resistance infinite. The
internal resistance of the battery is negligible. Calculate the necessary value of
the variable resistance R so that the battery charging current is 1.0 A.
(10 Marks)
D
R
120 V
y = 250 sin ot
Fig04b​

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Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj