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Electrical Fundamentals > Electrical test > Flashcards

Electrical test Flashcards

1
Q

Atom

A

Smallest particle of an element

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2
Q

Nucleus

A

Has protons and uncharged particles called neutrons

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3
Q

Atomic number

A

The number of protons a element has.

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4
Q

Ammeter

A

An electrical instrument used to measure current

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5
Q

Ampere

A

The unit of electral current

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6
Q

Atom

A

the smallest particle of an element

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7
Q

AWG

A

American Wire Gauge; a standardization based on wire diameter

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8
Q

Charge

A

can be - or +

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9
Q

Circuit

A

Has a source, a load, and an interconnecting current path

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10
Q

Conductance

A

The ability of a circuit to allow current. The unit is siemens (S)

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11
Q

Coulomb

A

The unit of electrical charge 6.25 x 10^18

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12
Q

Closed circuit

A

A circuit with a complete current path

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13
Q

Coulombs law

A

V=W/Q

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14
Q

Current

A

The rate of flow of charge (free electrons)

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15
Q

Current Source

A

A device that produces a constant current for a varying load

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16
Q

DMM

A

Digital multi meter; an electronic instrument that combines meters for measurement

17
Q

Fuel cell

A

a device that converts electrochemical energy from an external source into dc voltage . the hydrogen fuel cell is the most common one

18
Q

Fuse

A

a protective device that burns open when there is excessive current in circuit

19
Q

Ground

A

The common or reference point in a circuit

20
Q

Load

A

an element (resistor or other component) connected accross the output terminals of a circuit that draws current from the source and upon which work is done

21
Q

Ohm

A

the unit of resistance

22
Q

Ohmeter

A

An instrument for measuring resistance

23
Q

Open circuit

A

Not a complete current path

24
Q

Potentiometer

A

A three terminal variable resistor

25
Q

Resistance opposition to current. The unit is the ohm

A
26
Q

A rheostat

A

a two terminal variable resistor

27
Q

Volt

A

the unit of voltage or electromotive force

28
Q

Resistance of a wire depends on

A

Type of material, length of wire, cross sectional area

29
Q

How to generate DC voltage

A

batteries,
solar cells,
generators (DC, AC)
power supply, thermocouples

30
Q

Variable resistors

A

Potentiometer: to divide control voltage
Rheostat:to control current

31
Q

Electrical current

A

The rate of flow charge

32
Q
A

Electrical Fundamentals (2 decks)

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