103F Methods of Producing EMF and Magnetism

Question 1

_____ is potential energy that is ready to do electrical work

Answer 1

Electromotive force (EMF)

Question 2

Kinetic energy is

Answer 2

based on motion

Question 3

Potential energy is

Answer 3

based on position

Question 4

EMF is produced by

Answer 4

1. Chemical reaction
2. Heat
3. Pressure
4. Light
5. Magnetism
6. Electrostatics

Question 5

Producing an EMF by adding heat is commonly done by heating the junction of 2 dissimilar metals and this is called

Answer 5

Seebeck Effect

Question 6

Thermoelectric generator that change heat into electricity is

Answer 6

Thermocouple

Question 7

The method of producing electricity from pressure of force is called

Answer 7

Piezoelectricity

Also means push-electricity

Question 8

Alternator

Answer 8

1. changes AC <-> DC
2. changes Frequency

Question 9

Generator

Answer 9

Creates Electricity

Question 10

_____ generation is the least utilized electromotive force producing method

Answer 10

Electrostatic

Strength (low)
Cost (high)

Question 11

When all of the _____ in a group of atoms align, the result is a magnetic domain

Answer 11

Magnetic moments

Question 12

Left hand conductor rule

Answer 12

1. Curve of Fingers = Direction of Force
2. Direction of Thumb = Direction of Current

Question 13

3 basic factors affect the strength of an electromagnet

Answer 13

1. The amount of current in the coil
2. The number of turns of wire in the coil
3. The type of core within the coil

Question 14

When other factors are kept constant, the strength of the magnetic field is directly proportional to the number of turns

T or F

Answer 14

True

Question 15

_____ opposes changes in current and acts like resistance

Answer 15

Inductance

Question 16

Symbol for inductance

Answer 16

L

Question 17

The unit of inductance measurement is the

Answer 17

henry (H)

Question 18

What happens when a conductor moves through magnetic flux?

Answer 18

It develops an EMF

Question 19

What is the term for an electrical charge at rest?

Answer 19

Electrostatic

Question 20

What electrical charge technology is the basis for a precipitation-type of air filter?

Answer 20

Electrostatic

Question 21

Which of the following are required to form a magnetic domain?

Answer 21

Magnetic moments

Question 22

A temporary magnet is a magnet with magnetic domains aligned only while they are subjected to a magnetizing force

T or F

Answer 22

True

Question 23

What is magnetic flux?

Answer 23

The lines of force in and around the magnet

Question 24

What is residual magnetism?

Answer 24

Magnetism that remains in a material after the magnetizing force is removed

Question 25

What is inductance?

Answer 25

The property of an electrical circuit where a current change forces the rise of a voltage flowing in the reverse direction of the incoming voltage

Question 26

What is self-induction?

Answer 26

The result of current flowing through a coil, creating magnetic fields around each wire in the coil and those magnetic fields in turn affecting the current flow in the adjacent wires

Question 27

What is mutual induction?

Answer 27

occurs when a change of current in one circuit causes an induced voltage in another circuit nearby