Topic 6

Question 1

Electric Generator

Answer 1

device that converts mechanical energy into electrical energy

Question 2

Electricity to magnetism

Answer 2

magnets pull on electrons which cause the electrons to move in one direction

Question 3

How to increase current in a generator

Answer 3

A) more coils of wire; the more electrons able to be moved
B) stronger magnet; the stronger the pull on electrons
C) more speed; the magnet or wires need to move in order to get a current to happen

Question 4

Electromagnet

Answer 4

When a soft iron core is inserted into a coil of wire and current is passed through the wire creating a temporary magnet

Question 5

How to increase strength of electromagnet

Answer 5

• More coils
• better core material
• greater current

Question 6

Magnetism to electricity

Answer 6

Voltage is created in wires that are moved at an angle to a nearby magnet or a magnet is moved at an angle to a stationary wire

Question 7

Generator

Answer 7

device that converts mechanical energy into electrical energy

consists of a coil of wire that rotates around a stationary magnet(or electromagnet)

Question 8

AC generator

Answer 8

produced alternating current from a coil of wire rotating around a stationary magnet. After each half rotation each side of the coil passes near the opposite pole of the magnet. This cause the current produced to alternate.

Advantage is it is easy to step up or down the voltage for transport

Question 9

DC generator

Answer 9

often called a dynamo. In a dynamo the armature is connected to the outside by a split ring commutator. As the armature spins, the commutator turns off. It turns back on and the current is reversed but so has the connection of the commutator. This creates one directional flow

Question 10

DC motor

Answer 10

a coil or wire(armature) becomes an electric magnet as current flows through it. The armature is attracted and repelled by the field magnets. As it spins the commutator turns on and off. This reverses the polarity of the magnets so the armature keeps spinning in one direction

Question 11

AC motor

Answer 11

Ac motors have a rotor made up of non-magnetic conducting wires connected at the ends and held in a steel cylinder. Surrounding the rotor is a stator. stator is a two pole electromagnet. When current passes through it, the attraction and repulsion between magnetic poles of the rotor and stator causes the rotor to spin.