# Thread: determine the current flowing thru an element

1. ## determine the current flowing thru an element

determine the current flowing thru an element is the charge flow is given by:

(a) $q(t) = (3t+8) mC$

assume the way to do this is just

$
i= \frac{dq}{qt}=\frac{d}{dt} (3t+8)mC= \boxed{3mC}
$

assume we keep the same units for answer.
there are 4 more of these
just seeing if doing what should be.

2. Looks good to me, except the units are incorrect. You should have some version of amps going on there for the current.

3. ## (b)

oops... yes it should $3m[A]$

(b)
$q(t) = (8t^2+4t-2)[C]$

so thus for i

$i=\frac{dq}{qt}=\frac{d}{dt} (8t^2+4t-2)C=(16t+4)[A]$

4. Sure.