Chapter 1: Unit's associated with basic electrical circuits. Flashcards

(14 cards)

1
Q

Define an electric current.

A

Electric current is the rate of movement of change.

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2
Q

State the symbol for electric current and the unit.

A

Symbol: I
Unit: Ampere

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3
Q

State the 3 main effects of electric current.

A

-Magnetic effect
-Heating effect
-Chemical effect

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4
Q

List examples of the magnetic effect.

A

-Bells
-Relays
-Motors
-Generators
-Transformers
-Telephones

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5
Q

List examples of the heating effect

A

-Cookers
-Water heaters
-Electric fires
-Irons
-Furnaces
-Kettles
-Soldering irons

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6
Q

List examples of the chemical effect

A

-Primary and secondary cells
-Electroplating

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7
Q

Describe direct current

A

Direct current is one that flows in one direction only around a circuit

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8
Q

Describe alternating current

A

Alternating current is one that constantly changes direction in a circuit, rising to a maximum in one direction before falling to zero and then rising to a maximum in the opposite direction.

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9
Q

Define a conductor

A

A material having a low resistance that allows electric current to flow through it.

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10
Q

List examples of conductors.

A

-Copper
-Aluminium
-Brass
-Platinum
-Silver
-Gold
-Carbon

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11
Q

Define an insulator.

A

A material having a high resistance that does not allow electric current to flow through it.

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12
Q

List examples of insulators.

A

-Plastic
-Rubber
-Glass
-Porcelain
-Air
-Paper
-Cork
-Mica
-Ceramics
-Certain oils

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13
Q

Define a semiconductor

A

A material with an electrical conductivity between that of a conductor and an insulator, it is neither a good insulator nor a good conductor under ordinary conditions, but can be made to exhibit some of the properties of each.

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14
Q

List examples of semiconductors

A

-Silicon
-Germanium

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