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Electrical Science > Ch 1 > Flashcards

Ch 1 Flashcards

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1
Q

Force of attraction or repulsion of 2 charged particles.

A

Electrostatic Force

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2
Q

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

A

Potential Difference

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3
Q

Sum of all potential differences around a circuit.

A

Electromotive Force

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4
Q

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.

A

Coulombs Law

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5
Q

measured at any 2 points in an electrical circuit?

A

Potential Difference

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6
Q

Unit for potential difference and electromotive Force

A

Volt

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7
Q

What occurs when energy is gained by free electrons?

A

Voltage Rise

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8
Q

What occurs when energy is lost by free electrons?

A

Voltage Drop

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9
Q

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

A

Conductor

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10
Q

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

A

Insulator

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11
Q

Material that conducts electricity, but opposes current flow.

A

Resistor

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12
Q

Current flow from negative to positive potentials.

A

Electron Current Flow

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13
Q

Current that flows continuously in the same direction.

A

Direct Current

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14
Q

Current that periodically reverses direction.

A

Alternating Current

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15
Q

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

A

Capacitor

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16
Q

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

A

Capacitance

17
Q

Force that is the result of electrons spinning.

A

Magnetism

18
Q

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

A

Magnetic Domains

19
Q

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

A

Magnetic Flux

20
Q

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

ie steel, iron, nickel, cobalt

A

Magnetic Materials

21
Q

Ability of a material to concentrate magnetic flux.

A

Permeability

22
Q

States that like poles repel and unlike poles attract.

A

Law of Magnetism

23
Q

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

A

Magnitude of induced voltage

24
Q

These are used to open/close electromagnetic devices.

ie such as relays, starters, valves

A

Magnetic Coils

25
Q

Opposition to changes in current flow of a circuit.

A

Inductance

26
Q

Process of generating a voltage in a conductor

By having the conductor cut across flux lines of a magnetic field.

A

Induction

27
Q

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

A

Self-Induction

28
Q

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

A

Electrostatic Field

29
Q

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

A

Free electrons

30
Q

Units

A

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

31
Q
  1. Number of turns of a coil
  2. How fast conductor cuts across magnetic line of force.
  3. Strength of magnetic field
A

Faradays Law

32
Q

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.
A

Counter Electromotive Force CEMF

33
Q

Force that holds electrons in orbit.

A

Electrostatic Force

Electrical Science (5 decks)

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