Final Flashcards
Ohm’s Law
The flow of current through a conductor is directly proportional to the voltage and inversely proportional to the resistance.
Conventional Flow VS. Electron Flow
Conventional flows positive to negative, Electron negative to positive.
Electromotive Forceel
The force that causes electrons to move in an electrical circuit.
Kirchhoff’s voltage law
The sum of the voltage drops around any loop of a circuit is equal to the voltage source. Parallel circuits.
Kirchhoff’s Current Law
The current leaving any point is equal to the current arriving at that point, which means current is the same anywhere in a series circuit.
Impedance in a AC circuit
Resistance, inductive reactance, capacitive reactance
Thermocouple
A device consisting of two different conductors that produce a voltage.
AC Power Generation
Relative motion between a wire and a magnetic field generates an EMF and a flow of current in a closed circuit.
Transformers
Voltage is proportional to number of turns and current is inversely proportional.
Output of power generations is determined by?
Strength of the magnetic field, number of conductors, and the speed that the magnetic field is crossed.
Pulsating DC
DC whose voltage periodically changes, but whose electrons always flow in the same direction.
What is a commutator?
A mechanical rectifier mound on the armature of a DC generator.
Pro’s of using AC generators
Produce high voltage so less current can be sued, smaller wires, easily transformed, simpler and more reliable.
Series wound
not practical because they can’t be controlled
Compound wound generate
They are normally starter-generators
