15 uF, 20 kV oilfilled capacitor

Physikfan, Tue Mar 21 2017, 07:15PM

A real heavyweight, I could lift the thing with only two arms:



The energy when charging with 20 kV is:

Ec = 0.5 * 15 * (10 ** - 6) * (20,000) ** 2 = 7.5 * (10 ** - 6) * 4 * (10 ** 8) = 3000 Ws.

At the same time, this is approximately the energy of a mass of 10 kg after a free fall of 30 m height at the time of the impact.

Comparing this with the energy of the 10 nF 200kV capacitor:
Ec = 0.5 * (10 ** - 8) * (200,000) ** 2 = 0.5 * (10 ** - 8) * 4 * (10 ** 10) = 200 Ws

We can see that the voltage is higher by a factor of 10, yields 100 times more,
But the capacity is higher at the other by the factor 1500, which gives the difference!

If you charge a 6 F capacitor to 32 V, you have the same energy as in the 15 μF, 20 kV capacitor.