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Int-Science > Electricity And Lighting (Chapter 11) > Flashcards

Electricity And Lighting (Chapter 11) Flashcards

1
Q

Why is electric very important?

A

It is a very important part of everyday life. It is used in homes and workplaces for many purpose

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2
Q

What are conductors?

A

Are material containing eclectic charges which can flow freely

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3
Q

Example of conductor

A

Metal, sliver, copper

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4
Q

What are insulator?

A

Are material in which eclectic charges can not flow freely

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5
Q

Example of insulator

A

Wood, plastic, rubber, glass

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6
Q

What are Semi conductors?

A

Are material that is both good conductors and insulator

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7
Q

Example of Semi conductors

A

Silicon, germanium

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8
Q

What is one use of a Conductors?

A

To make electricity wires

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9
Q

What is one use of Insulator?

A

To cover electrical wires and to ensure certain appliances

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10
Q

What is one use of Semi conductors?

A

To make Electrionic components

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11
Q

What is a Electric circuits?

A

Is a complete path or loop through electrons can flow from a source and then return to the source

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12
Q

What are the main importance electrical quantities?

A

Voltage, Current, Resistance and Power

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13
Q

What is voltage SI unit and symbol?

A

The SI unit is volt and the symbol is V

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14
Q

What is Current SI unit and symbol?

A

The SI unit is ampere and the symbol is A

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15
Q

What is Resistance SI unit and symbol?

A

The SI unit is ohm and the symbol is a horse shoe

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16
Q

What is Power SI unit and symbol?

A

The SI unit is watt and the symbol is W

17
Q

How to calculate Voltage?

A

Voltage=Current(I)×Resistances(R)

18
Q

How to calculate Power?

A

Power=Voltage(V) × Current (I)

19
Q

How to calculate Resistance?

A

Resistance=Voltage (V) ÷ Current (C)

20
Q

What colour is used for Earth wires?

A

Green and yellow

21
Q

What colour is used for live wires?

A

Brown

22
Q

What colour is used for Neutral wires?

A

Blue

23
Q

What happens when a circuit is overload?

A

There will be overheating, destroying of insulation and even causing fires

24
Q

What is a fuse?

A

Is a short wire that melts and breaks a circuit when the current exceeds a certain value

25
Q

How does a fuse protect an appliances such as a hairdryer?

A

Int-Science (11 decks)

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