Design a Capacitor: 10W, 0.5s, 12V

[cfl25]

Homework Statement

You are to design a capacitor capable of providing the energy required to start a small motor. In particular, the capacitor must meet the following three requirements
a) The capacitor must provide an average power of 10W for a time interval of 0.50 seconds
b/ Macimum allowable Capacitor potential difference = 12V

Homework Equations

C = Q/V

The Attempt at a Solution

I am kinda stumped on the average power 10W over 0.5 seconds. Does that mean that i convert back into Energy of 5J or something else?

 

[skeptic2]

You're missing a relevant equation. Look for one that defines energy in terms of capacitance and voltage.

 

[cfl25]

you're missing a relevant equation. Look for one that defines energy in terms of capacitance and voltage.

u = (1/2)cv² ?

 

[skeptic2]

That's it.

 

[cfl25]

is there an equation or an explanation that will help me understand the values if the plates are a foil and rolled together, so it keeps the area needed at a reasonable size?