Answer to Question 5

 

Back

An ignition coil is required to give out an EMF of 5000 V. The current it takes is 5.0 A and the current decays to zero in a time of 10.0 ms. Calculate the inductance.

 Formula:

dI/dt = 5.0 A 10.0 10-3 s = - 500 A s-1 (as it's falling to zero).

 

L = -5000 V 500 A s-1  = 10 H