L Theory Flashcards
What is the name of the outer most orbit
Valence shell
Electrons move through easily
Conductors
Electrons can’t travel through
Insulators
What direction do electrons flow
Negative to positive
What is current?
The movement of free electrons along a conductor
What is conventional flow?
Positive flowing through to negative
1 amp is equal to?
6.214 x 10^8
What is current measured in
Amps ‘A’
Different conductors
Copper, brass, silver, carbon, impure water, aluminium, platinum, mercury, gold
Insulators
Wood, paper, rubber, mica, porcelain, woven fabrics, plastic, glass
Factors that affect resistance
Length of conductor
The cross section area
Temperature
What is ohms law?
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.
How do you find voltage
I x R
How do you find resistance?
V/I
How do you find current?
V/R
What 3 ways can circuit components be connected
Series
Parallel
Series-parallel
What equation is used to find power
P=I x V
How many watts are in 1 horsepower
746 watts
How many watts are in 1 horsepower
746 watts
Two types of fuses
Cartridge
HRC (high rupturing capacity)
Causes of earth faults
Dampness
Insulating becoming old or brittle
Accidental damage
What are like poles?
Either 2 norths or 2 south’s together
What are unlike poles
1 north and 1 south together
2 kinds of magnets
Horseshoe magnet
Bar magnet
