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Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles ## Electrostatics ## Electric Fields ## Capacitance ## Charge on a Capacitor ## Electric Field Strength ## Examples: Electric Field Strength ## The Unit of Capacitance ## Charge Capacitance and Voltage ## Energy Stored in a Capacitor ## Examples: Capacitance ## The Unit of Inductance ## Flux Linkage and Current ## Energy Stored in an Inductor ##

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ElectronicPrinciples /

Examples: Inductance

<^< Energy Stored in an Inductor | Course Index | Magnetism >^>(:nl:)

>>frame round<< Example 1:

A current increases at a uniform rate from 1A to 4A in a period of 0.5ms. If this current is applied to an inductor of 1.5H, determine the voltage induced. >><<

>>id=example1 class=question margin=10px frame round<< Now the induced voltage will be given by:

e = - L x ( rate of change of current )
= -L x ( change in current / time )
= -1.5 x ( ( 4 - 1 ) / 0.0005 )
= -9000V >><<

>>frame round<< Example 2:

A current of 1.5A flows in an inductor of 2H.

Determine the flux present if there are 600 turns on the inductor. >><<

>>id=example2 class=question margin=10px frame round<< Re-arranging N&#934; = L I to make &#934; the subject gives:

&#934; = L I / N = 2 x 1.5/600 = 5 mWb >><<

>>frame round<< Example 3:

Determine the energy stored in an inductor of 60mH when a current of 2A is applied to it. >><<

>>id=example3 class=question margin=10px frame round<< Using W = ½ C V2 gives:

Using E = 0.5 L I'^2^' gives:

E = 0.5 x 60 x 10'^-3^' x (22) = 30 x 10'^-3^' x 4
= 120 mJ >><<(:nl:)(:table style="clear:both":)

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