Question for any bright spark

[Lee1987]

Hi everyone,

Im a qualified electrician but am now re-training to be an Overhead lines man and have basically got to do another apprentiship, Im doing a course called MOL (manchester open learning) and the course is similar to my old apprentiship, Im struggling with remembering some formulas and am trying to complete a practice paper, heres a question I am struggling with as I cant seem to find the formula I need, any help much appreciated;

a 15 H Coil (inductor) carries a current of 7 A. What amount of energy is stored in the magnetic field?

Thanks
Lee

 

[Guest111]

after 4 cans I don't feel a bright spark, more like a happy spark.lol

after 4 cans I used to feel like an 18 year old blonde,but the wife said I couldnt have one,lol