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RTE 011 > Electricity and Magnetism > Flashcards

Electricity and Magnetism Flashcards

1
Q

– The study of stationary electric charges.

A

Electrostatics

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2
Q

– The study of electric charges in motion.

A

Electrodynamics

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3
Q

► Electrification can be created by ____

A

contact, friction, or induction.

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4
Q

It is due to the movement of negative electric charge.

A

Electrification

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5
Q

The smallest unit of electric charge is the _____.

A

electron

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6
Q

The fundamental unit of electric charge is _____.

A

coulomb (C)

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7
Q

► Have neutrons, protons, and electrons. ► Protons are positively charged
► Electrons are negatively charged

A

Atoms

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8
Q

► Are located on the outer edges of atoms…they can be moved.

A

Electrons

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9
Q

► The build up of an electric charge on the surface of an object.

A

Static Electricity

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10
Q

► Occurs when there is a loss of static electricity due to three possible things:
► Friction - rubbing
► Conduction – direct contact
► Induction – through an electrical field (not direct contact)

A

Static Discharge

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11
Q

Electricity that moves…

A

Kinetic energy

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12
Q

2 types of currents

A

Direct Current
Alternating Current

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13
Q

•Where electrons flow in the same direction in a wire.

A

Direct Current (DC)

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14
Q

► electrons flow in different directions in a wire

A

Alternating Current (AC)

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15
Q

•The components are lined up along one
path. If the circuit is broken, all components turn off.

A

Series Circuit

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16
Q

– there are several branching paths to the components. If the circuit is broken at any one branch, only the components on that branch will turn off.

A

Parallel Circuit

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17
Q

– material through which electric current flows easily.

A

Conductors

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18
Q

– materials through which electric current cannot move.

A

Insulators

19
Q

► A _____ is a material that under some conditions behave as an insulator and in other conditions behaves as a conductor.

A

semiconductor

20
Q

______ is the property of some materials to exhibit no resistance below a critical temperature (Tc)

A

Superconductivity

21
Q

► The opposition to the flow of an electric current, producing heat.
► The greater the resistance, the less current gets through.
► Good conductors have low resistance.
► Measured in ohms.

A

Resistance

22
Q

The measure of energy given to the charge flowing in a circuit.

A

Voltage

23
Q

The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance.

A

Ohm’s Law

24
Q

– a magnet made from a current bearing coil of wire wrapped around an iron or steel core.

A

Electromagnet

25
Q

– a machine that changes mechanical energy to electrical energy

A

Generator

26
Q

– a device that changes electrical energy to mechanical energy that can do work.

A

Motor

27
Q

A concentration of electrons in an atom creates a net ____ charge.

A

negative

28
Q

If electrons are stripped away, the atom becomes ____ charged.

A

positively

29
Q

: The flow of electrons from one place to another.

A

Current

30
Q

: is a path for the flow of electrons.

A

Circuit

31
Q

The greater the resistance, the ___ current gets through.

A

less

32
Q

Good conductors have ____ resistance.

A

low

33
Q

► The charge builds up but does not flow.

A

Static Electricity

34
Q

►______ is potential energy. It does not move. It is stored.

A

Static Electricity

35
Q

1C is equal to how many electron charges

A

6.24x10 by the power of 18

36
Q

The total resistance is equal to the sum of the individual resistances.

A

Series Circuit

37
Q

The current through each circuit elements is the same and is equal to the total circuit current.

A

Series Circuit

38
Q

The sum of the voltages across each circuit element is equal to the total circuit voltage.

A

Series Circuit

39
Q

. The sum of the currents through each circuit element is equal to the total circuit current.

A

Parallel Circuit

40
Q

The voltage across each circuit element is the same and is equal to the total circuit voltage.

A

Parallel

41
Q

The total resistance is the inverse of the sum of the reciprocals of each individual resistance.

A

Parallel

42
Q

Examples of semiconductors

A

Silicon
Germanium

43
Q

Examples of superconductivity

A

Niobium and Titanium

44
Q

Measured in ohms

A

Resistance

RTE 011 (4 decks)

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