Inductors - Beginners

Question 1

Describe Inductance

Answer 1

Inductance is the tendency of an electrical conductor to oppose a change in the electric current through it.

Question 2

An inductor is just a coil of ……….

Answer 2

wire

Question 3

An inductor …….. ? changes in current.

Answer 3

Resists / Opposes

Question 4

An electrical current running through a wire produces a weak ………. ………. surounding the wire

Answer 4

magnetic field
(Energy is stored in this magnetic field)

This is why a compass needle moves when close to an electrical circuit.

Question 5

When the magnetic field settles down the Inductor eventually acts like a ?

Answer 5

Short circuit
(The voltage across the inductor is zero and the full
DC current is passes through.)

Question 6

When DC is first applied to an inductor it acts like ….

Answer 6

An open circuit.

No current flows immediately and the entire source voltage is dropped across the resistor.

Question 7

If the DC source was removed from the inductor and a resistor placed across the inductor , Where would the energy be transferred to and how is it dissipated?

Answer 7

The energy is transferred to the resistor and dissipated as heat.

Question 8

When a current is passed through an inductor a magnetic field is created around the wire. If the current is changed ( increased or decreased ) the magnetic flux around the coil( inductor) changes and a voltage is induced across the inductor. The voltage is sometimes call a …….

Answer 8

Back voltage

Question 9

The Back Voltage causes a current to flow that ……… the main current flow.

Answer 9

Opposes

Question 10

TBA