The vacuum pressure of a condenser is given to be 80 kpa. if the atmospheric pressure is 98 kpa, what is the gage pressure and absolute pressure in kpa, kn/m2, lbf/in2, psi, and mm hg.

The absolute pressure is given by the equation,

Here, is absolute pressure, is atmospheric pressure and is vacuum pressure.

Therefore,

The gage pressure is given by the equation,

.

Thus,

.

In kn/m^2,

The absolute pressure,

The gage pressure,

.

In lbf/in2

The absolute pressure,

The gage pressure,

In psi,

The absolute pressure,

.

The gage pressure,

In  mm Hg

The absolute pressure,

The gage pressure,

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j