AC Theory Flashcards
EMF drives the current through the circuit has a … potential at one end and a … potential at the other
Positive
Negative
DC stands for?
Direct current
What does AC stand for)
Alternating Current
A … changes the relative size of voltage and current without appreciable loss of power
Transformer
Transformers will not work on …
DC
2 advantages of using transformers on ships?
Wiring and equipment can be much lighter
Issuing transformers, voltages can be provided at different values easier.
The speed at which the alternating current changes directions is called the …
Frequency
The level to which the voltage or current rises is called the …
Amplitude
As in the direct current system, alternating current is measured in …
Amperes
On ships, the main power supply is made up of … phases (sine waves) operating at the same frequency and voltage
3
The … phases are generated in a 3 phase generator at … volts where phase completes one cycle in 1/60 second ie 60 …
3
450
Hertz
When a length of wire is formed into a coil it becomes a … …
Basic inductor
Current flowing through a coil produces an … …
Electromagnetic field
The … … of force around each turn in the winding of the coil effecting add to the lines of force around the adjacent loops, forming a string … … writhing and around the …
Magnetic lines
Magnetic field
Coil
Inductance is a new sure if a could ability to establish an … … as a result of a … in its …
Induced voltage
Change
Current
