general electricity Flashcards
what are 5 sources of electrical energy
magnetism, chemical energy, light, heat, pressure
which law of electricity is the most important for an aircraft mechanic to know
ohms law
what are the elements of ohms law
voltage E, current I, resistance R (volts, amps, ohms)
what is the name of the law that describes the relationship in an electrical circuit of voltage, current, resistance
ohms law
what is the basic equation of ohms law
E=IxR
what is meant by resistance in an electrical circuit
the opposition to flow of electrons
what is the basic unit of electrical resistance
the ohm
what four things affect the resistance of an electrical conductor
the material, the cross sectional area, the length, the tempature
how can you tell the resistance of composition resistor
by a series of colored bands around one end of the resistor
what formula is used to find resistance when voltage and current are known
resistance= voltage divided by current
R= E/I
what is the formula for power in DC circuit
power= voltage times current (P=ExI)
what is the relationship between mechanical and electrical power
1 horsepower= 746 watts
what is meant by true power in an AC circuit
the product of the circuit voltage and the current that is in phase with this voltage
in what units is true power expressed
in watts
what is meant by apparent power in an AC circuit
the product of the circuit voltage and the circuit current, without reference to phase angle
