An automatic external defibrillator AED delivers 129 J of en

An automatic external defibrillator (AED) delivers 129 J of energy at a voltage of 1030 V. What is the capacitance of this device?

Solution

Energy stored in a capacitor = 1/2 C V²

129 = 1/2 * C * 1030²

C = 129 * 2 / 1030²

= 0.000243 F = 2.43 * 10^-4 F = 243 muF