Aed Voltage

An automated external defibrillator (AED) delivers 110 J of energy at a voltage of 900 V. What is the capacity of this device?

The energy stored in a capacitor is 1 / 2. C. V ^ 2

110 = 1 / 2. C. 900 ^ 2

C = 220/900 = 2.7 ^ 2. 10 ^-4F = 270 mF