Ch 1

Question 1

Force of attraction or repulsion of 2 charged particles.

Answer 1

Electrostatic Force

Question 2

Measures how large the electrostatic force is between 2 charged objects.

Answer 2

Potential Difference

Question 3

Sum of all potential differences around a circuit.

Answer 3

Electromotive Force

Question 4

Charged bodies attract or repel each other with a force that is proportional to their charges and is inversely proportional to the square of the distance between them.

Answer 4

Coulombs Law

Question 5

measured at any 2 points in an electrical circuit?

Answer 5

Potential Difference

Question 6

Unit for potential difference and electromotive Force

Answer 6

Volt

Question 7

What occurs when energy is gained by free electrons?

Answer 7

Voltage Rise

Question 8

What occurs when energy is lost by free electrons?

Answer 8

Voltage Drop

Question 9

Material with electrons loosely bound to its atoms or that permits free motion of a large number of electrons.

Answer 9

Conductor

Question 10

Material with electrons tightly bound to its atoms and requires large amounts of energy to free electrons from its nuclei.

Answer 10

Insulator

Question 11

Material that conducts electricity, but opposes current flow.

Answer 11

Resistor

Question 12

Current flow from negative to positive potentials.

Answer 12

Electron Current Flow

Question 13

Current that flows continuously in the same direction.

Answer 13

Direct Current

Question 14

Current that periodically reverses direction.

Answer 14

Alternating Current

Question 15

Alternately stores and releases electrical energy by the strength of the electrostatic field in the dielectric.

Answer 15

Capacitor

Question 16

Measure of the size of the charge that can be stored in the capacitor.

Answer 16

Capacitance

Question 17

Force that is the result of electrons spinning.

Answer 17

Magnetism

Question 18

Small regions in a magnetic material where the force from electron spin does not cancel out.

Answer 18

Magnetic Domains

Question 19

Group of magnetic field lines emitted outward from the North Pole of a magnet. Formed by alignment of domains with magnetic material.

Answer 19

Magnetic Flux

Question 20

Materials that contain domains which can align to form a magnetic flux around the material.

ie steel, iron, nickel, cobalt

Answer 20

Magnetic Materials

Question 21

Ability of a material to concentrate magnetic flux.

Answer 21

Permeability

Question 22

States that like poles repel and unlike poles attract.

Answer 22

Law of Magnetism

Question 23

What depends on the number of turns of a coil and how fast the conductor cuts across the magnetic lines of force or flux?

Answer 23

Magnitude of induced voltage

Question 24

These are used to open/close electromagnetic devices.

ie such as relays, starters, valves

Answer 24

Magnetic Coils

Question 25

Opposition to changes in current flow of a circuit.

Answer 25

Inductance

Question 26

Process of generating a voltage in a conductor By having the conductor cut across flux lines of a magnetic field.

Answer 26

Induction

Question 27

Property of a coil to generate CEMF to oppose changes in current flow through itself.

Answer 27

Self-Induction

Question 28

Area under the influence of electrostatic charges. Any electrons will be acted upon by electrostatic Force.

Answer 28

Electrostatic Field

Question 29

Valence electrons that leave the atom. They gain energy and create an electrical pressure.

Answer 29

Free electrons

Question 30

Units

Answer 30

Amp / Current / I Volt / voltage / E Ohm / Resistance / R Watt / power / P

Question 31

1. Number of turns of a coil 2. How fast conductor cuts across magnetic line of force. 3. Strength of magnetic field

Answer 31

Faradays Law

Question 32

Generated voltage that opposes voltage applied to the coil. 1. Occurs when magnetic field is changing 2. Magnitude of CEMF depends on strength of magnetic field and how fast field is changing.

Answer 32

Counter Electromotive Force CEMF

Question 33

Force that holds electrons in orbit.

Answer 33

Electrostatic Force