# The series R-L circuit -Question 4A

#### Bobby2017

Joined Dec 28, 2019
19
Wondering if my answers are correct and if i have the correct equations for the corresponding question
Thanks

#### WBahn

Joined Mar 31, 2012
29,865
You need to properly track your units throughout your work. Had you done so you might have caught most of the several mistakes you made as a result of not doing so.

#### SamR

Joined Mar 19, 2019
5,019
One of the most important calculations in any science is Unit Conversions. Especially when dealing with both the English Foot/Pounds and the SI mks/cgs systems.

#### Bobby2017

Joined Dec 28, 2019
19
is this better?

#### Bobby2017

Joined Dec 28, 2019
19
Just wondering if my answers are correct and if not where have i gone wrong?
Cheers

#### MrAl

Joined Jun 17, 2014
11,268
View attachment 196038View attachment 196037Just wondering if my answers are correct and if not where have i gone wrong?
Cheers
Hi,

Doesnt look right.

The problem specifies values of R=25 Ohms and C=45uf.

What is the value of the cap, it is 45uf, and how do you convert that to Farads?
In other words, what is 1uf in Farads (then 45 times that amount)?

#### SamR

Joined Mar 19, 2019
5,019
You didn't convert the kΩ value for Xc. You left the k off. And on a personal note, why on earth are you doing the calculations in ink!?!? Nice neat penmanship and sketches though.

#### MrAl

Joined Jun 17, 2014
11,268
You didn't convert the kΩ value for Xc. You left the k off. And on a personal note, why on earth are you doing the calculations in ink!?!? Nice neat penmanship and sketches though.
Hi,

I would argue the ink vs pencil thing but the photos are very readable unlike many of the stuff i see come through here
Congrats to the OP for the legible photos.