try this for size INDUCTANCE

[searley]

calling andy.c

the current in a coil changes from 5a to 2a in 0.05 seconds and induces a voltage of 30v in the coil the inductance of the coil is ?

well stuck.

 

[Nicky Tesla]

its to do with the rate of change

 

[danny7299]

0.5H

 

[searley]

how did you get to 0.5H ?

city & guilds doing me head in.

 

[Andy™]

cant really remember this and a quick google doesnt bring up the correct formula, but i think it is

S x V / voltage change

(s=seconds)

so 0.05 x 30 / 3 = 0.5

*** this may be wrong***

 

[gullyboy_131]

its to do with the rate of change

:z

E= di/dt

E= 3/0.05

E= 60

di = change in current

dt= change in time

L= V/E

L=30/60

L=0.5H

here we go chaps hope this helps with exams coming up soon

 

[bonio78]

hi, where does the 3 come from in E= 3/0.05?

thanks

 

[Andy™]

5 - 2

tough one

are calculators allowed?

 

[Andy™]

Notice I didn't give the answer :slap

well, why would you ask a question and give the answer?!