Power Flashcards

1
Q

What is power measured in

A

Watts

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2
Q

Define electrical power

A

The rate of doing work

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3
Q

How many watts make 1 horsepower

A

746 watts

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4
Q

What is the danger of passing constant high current through a conductor

A

The conductor heats up

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5
Q

Two types of fuses

A

Cartridge fuse
Specialist fuse (fuse link)

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6
Q

What does the fuse protect

A

The power supply and the equipment

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7
Q

What happens to the the quarts powder in a HRc fuse when it blows

A

The powder soldifys on the fuse ends and stops arcing as it’s an efficient insulator

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8
Q

What is the electrical potential of the sea

A

0 Volts

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9
Q

Three things that can cause an earth fault

A

Dampness
Accidental damage
Insulators hardening

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10
Q

Why is equipment earthed to the hull of a ship

A

As it’s virtually impossible for someone to get a shock by touching the casing because everything goes into the sea

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