Answer to Question #175902 in Electric Circuits for Joshua Musyoki

Question

Consider two 100𝜇𝐹 capacitors. One is charged to10V, disconnected from the power supply, and then connected across the other. Calculate the energy stored by the combination 

Answer 1

$W=\frac{C_0 U_0^2}{2},$$C_0=C_1+C_2=2C,$

$U_0=U_1=U_2=U,$

$W=CU^2,$

$W=100\cdot 10^{-6}\cdot 10^2=0.01~J.$