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MARINE ENGINEERING > L Theory > Flashcards

L Theory Flashcards

1
Q

What is the name of the outer most orbit

A

Valence shell

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2
Q

Electrons move through easily

A

Conductors

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3
Q

Electrons can’t travel through

A

Insulators

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4
Q

What direction do electrons flow

A

Negative to positive

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5
Q

What is current?

A

The movement of free electrons along a conductor

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6
Q

What is conventional flow?

A

Positive flowing through to negative

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7
Q

1 amp is equal to?

A

6.214 x 10^8

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8
Q

What is current measured in

A

Amps ‘A’

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9
Q

Different conductors

A

Copper, brass, silver, carbon, impure water, aluminium, platinum, mercury, gold

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10
Q

Insulators

A

Wood, paper, rubber, mica, porcelain, woven fabrics, plastic, glass

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11
Q

Factors that affect resistance

A

Length of conductor
The cross section area
Temperature

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12
Q

What is ohms law?

A

Ohms law states that a current flowing through a conductor is directly proportional to true applied voltage across it (providing the temperature stays the same) and is inversely proportional to the resistance.

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13
Q

How do you find voltage

A

I x R

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14
Q

How do you find resistance?

A

V/I

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15
Q

How do you find current?

A

V/R

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16
Q

What 3 ways can circuit components be connected

A

Series
Parallel
Series-parallel

17
Q

What equation is used to find power

A

P=I x V

18
Q

How many watts are in 1 horsepower

A

746 watts

19
Q

How many watts are in 1 horsepower

A

746 watts

20
Q

Two types of fuses

A

Cartridge
HRC (high rupturing capacity)

21
Q

Causes of earth faults

A

Dampness
Insulating becoming old or brittle
Accidental damage

22
Q

What are like poles?

A

Either 2 norths or 2 south’s together

23
Q

What are unlike poles

A

1 north and 1 south together

24
Q

2 kinds of magnets

A

Horseshoe magnet
Bar magnet

25
Q

What creates electricity

A

Magnet
Coil
Relative movement

MARINE ENGINEERING (3 decks)

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