At the instant the valve (R) is opened, the pressure in the tank (C) is 100 lbs. and the pressure at the valve (R) is
100 lbs. The source of pressure is the water in the tank (C), and this same pressure is developed at the valve (R)).
Figure 9D.
In the RC circuit (fig. 9D), at the instant C starts to discharge, the voltage (pressure) on C is 100 volts and the
voltage across R (valve) is 100 volts.
The source of voltage (pressure) is the voltage on C, and this same voltage (pressure) is developed across R.
In .1 RC time, C discharges 10%, or 10 volts, which leaves 90 volts on C. THIS SAME 90 VOLTS IS ALSO
THE VOLTAGE ACROSS R (fig. 9E).
Figure 9F.
Figure 9E.
This compares with draining 10 lbs. of water pressure from the tank (fig. 9F), which leaves 90 lbs. of
pressure in the tank. This same 90 lbs. of pressure is felt at the valve (R).
In 1 RC time, C discharges 63% or 63 volts, which leaves 37 volts on C. THIS 37 VOLTS IS ALSO THE
VOLTAGE ACROSS R (fig. 9G).
Figure 9H.
Figure 9G.
This compares with the draining 63 lbs. of water from the tank (fig. 9H) which leaves 37 lbs. of pressure in the
tank (C). This 37 lbs. of pressure is felt at the valve (R).
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IT0351
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