Basic Electricity Reviewer

What did Michael Faraday discover?

• An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

• Moving a magnet through a coil of wire, a voltage was induced across the coil.

• Energy cannot be created or destroyed.

The induced EMF or electromagnetic force in a closed loop of wire is proportional to the rate of change of the magnetic flux through a coil of wire.

• Law of Motion

• Law of Thermodynamics

• Law of Electromagnetic Induction

When the wire is formed into a coil, what will it become?

• A basic Inductor

• Capacitor

• Resistor

What is the property of Inductance?

• to oppose any change in current through it.

• accumulates electric charge via electric field.

• pushes the electrons through the circuit.

Below are the physical parameters of the inductor.

i. The number of turns

ii. The length of a coil

iii. The number of electrons

• i only

• i and ii

• iii only

is the generation of a voltage in an electric circuit by a changing current in the same circuit.

• Self Inductance

• Mutual Inductance

• Induction

Occurs when the varying of a magnetic field in one circuit causes an EMF to be produced in a neighboring circuit due to their proximity to each other.

• Self Inductance

• Mutual Inductance

• Induction

What is the unit for inductance?

• Farad

• Ohms

• Henry

Aside from opposing any charge in current, what are the other properties of the inductor?

• accumulates electric charge via magnetic field

• accumulates electric charge via electric field

• there are no other properties than opposing the current.

Alternating current is in a constant state of change; the effects of the magnetic fields are a continuously inducted voltage opposition to the current in the circuit.

• Capacitive Reactance

• Inductive Reactance

• Resistive Inductance