Help on an exam question

[westos-electric]

Question
If a current of 200mA flows into a capacitor for 40ms how much charge will develop in the capacitor?

please help with the answer but i need to know how it's worked out

Thanks
Wayne

 

[westos-electric]

Hi

I must be entering it in to the calc wrong as i'm not getting it near the 8 microfarad and thats the answer given on the sample test paper.

Can you advise

cheers
wayne

 

[JUD]

Enter into calculator like this:

1 ÷ ((1 ÷ 19) + (1 ÷ 24) + (1 ÷ 32))

You should get 7.965 (8 rounded up)

 

[westos-electric]

Hey cheers!

I missed the extra (( )) out so was getting the wrong answer

Cheers

 

[pushrod]

Enter into calculator like this:

1 ÷ ((1 ÷ 19) + (1 ÷ 24) + (1 ÷ 32))

You should get 7.965 (8 rounded up)

Or if you have a (x-1) button on your calculator then
19(x-1) + 24 (x-1) + 32(x-1) = ans (x-1)

a lot quicker if your calculator has the right function

 

[JUD]

My mate's borrowed my calculator. I'm using the Windows one at the minute.

 

[pushrod]

My mate's borrowed my calculator. I'm using the Windows one at the minute.

There should be a 1/x button just above the = which is the same thing. Give it a go it's a very quick way of doing it

 

[JUD]

Yer there is.

Already sussed that out. Lot easier

 

[pushrod]

Certainly makes those parallel resistances questions a lot quicker to do

 

[JUD]

Certainly makes those parallel resistances questions a lot quicker to do

Just wish there was a way to use it without the mouse

 

[pineappletree]

In other words

V = √(P x R)


This may help

Aint seen this wheel for a while, did you goto lambeth college lol

 

[JUD]

Made that myself in photoshop.

Too much time on my hands

 

[pineappletree]

Made that myself in photoshop.

Too much time on my hands

lololol oh dear yeah me too. Im in the process of sending my CV to every single contractor in south london, so far it now stands at 320