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El THEORY I > Power > Flashcards

Power Flashcards

1
Q

Define Electrical Power.

A

Power = Voltage × Current

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2
Q

What is the unit of electrical power?

A

Watts

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3
Q

How many Watts make up 1 horsepower?

A

746 watts

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4
Q

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

A

Produces heat

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5
Q

Ne 2 types of fuse.

A

Fuse

HRC Fuse

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6
Q

What does the fuse protect from damage?

A

The power source

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7
Q

What happens to the quartz powder in a HRC fuse when the fuse blows and what does this prevent?

A

The powder melts and flow between the broken ends of the fusing element.

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8
Q

What is the electrical potential of the sea?

A

Zero Volts

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9
Q

List 3 things that can cause an earth fault in a circuit.

A

Dampness
Brittle with age
Accidental damage

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10
Q

Why is equipment earthed to the hull of the ship?

A

Dangerous as the shock could be fatal if current passed through the castings.

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11
Q

Sketch and label a fuse.

A
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12
Q

Sketch and label a HRC fuse

A
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El THEORY I (10 decks)

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