- #1

sinned4789

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## Homework Statement

the current through an element is i = 2t^2 - 1 Amps. if that element is a 4H inductor, what is the energy delivered to it from time t=1 to t=3.

## Homework Equations

energy in an inductor is dw = Li di

## The Attempt at a Solution

i = 2t^2 - 1

di = 4t dt

w = L integral[ (2t^2 - 1)(4t) dt ] from 1 to 3 seconds

i just want to confirm it with someone if i did it right or not. i felt like i did. thanks.