301 question

[mickys86]

Hi guys having trouble with a question at college. All help welcome!


If you can't read my writing I'll write the question out

 

[Plonker 3]

I take it that you don't understand the question, well this forum doesn't do other peoples homework, but will help you.

Write down what you think the answer is and your working out and someone from here with a better knowledge of what you are asking will help you I am sure.

 

[mickys86]

Your right, I don't understand it. Neither do the other ten people in the class! We'll get there!

 

[Silly Sausage]

Your right, I don't understand it. Neither do the other ten people in the class! We'll get there!

Without giving the game away, think about the rate of change of the current and the induced emf it produces.
It's a simple equation!

 

[mickys86]

Without giving the game away, think about the rate of change of the current and the induced emf it produces.
It's a simple equation!

Ok well here's my thinkings.....
V divided by I x time
The change in current is 3a
30v / 3a x 0.05 = 0.5h

 

[Silly Sausage]

Ok well here's my thinkings.....
V divided by I x time
The change in current is 3a
30v / 3a x 0.05 = 0.5H

That's what I got!

 

[mickys86]

Thank you. I'll post some other questions later just for entertainment values

 

[shortcourse]

Sorry if I'm late

emf (V) = Inductance (H) X Rate of change (Amps per second)

5 to 2 in 0.05 seconds = 3 in 0.05 or 60 per second

30v = Inductance X 60

30/60 = 0.5

Answer 0.5H (b)