induced potential, transforms

what happens when an electrical conductor moves relative to a magnetic field

potential difference is induced across ends of the conductor

what happens to an electrical conductor when there is a change to the magnetic field that it is placed in

potential difference is induced across the ends of the conductor

what is the requirement for an induced potential difference to cause a current flow

conductor must form a closed loop or be part of a complete circuit

what can be said about the direction of the magnetic field produced by an induced current

-direction of the field is such that it opposes the change that induced the current. -the change is either the movement of the conductor or a change to the field

what are two ways the generator effect is used to generate different types of current

-in an alternator to produce alternating current. -in a dynamo to produce direct current

what electromagnetic effect does a microphone take advantage of and how

generator effect as it converts the pressure variations in sound waves into alternating current in a circuit

describe the makeup of a basic transformer

a primary coil and a secondary coil of wire wrapped around an iron core

why is iron used as the core for a transformer

it is easily magnetised

explain how a transformer works

-an alternating current flows through the primary coil. -this induces a changing magnetic field in the core -this changing magnetic induces a current to flow in the secondary coil

why must the current flowing through the primary coil of a transformer be alternating

-for current to be induced in the secondary coil, the magnetic field in the core must be continuously changing. -the magnetic field to be changing, the current in the primary coil must be alternating

what can be said about the electrical power input and output of a 100% efficient transformer

electrical power input is equal to the electrical power output.