Alternating current AC basic terms Flashcards
what is the flow of electrons that continuously changes its value in magnitude and periodically reverses direction (sine-wave)
alternating current
what is the Product of effective voltage and effective current which is expressed in Volt Amps (VA) rather than Watts (W) without reference to phase shift, if any, between voltage and current
apparent power
what is opposition to current flow in a circuit
capacitive reactance (XC)
what are windings arranged in the shape of a circle
delta wounds
what is the amount of ac that produces the same amount of heat as a corresponding value of DC
effective voltage
what is the number of cycles of ac completed in one second
frequency
frequency is expressed in hertz 1hz is 1 cycle
what is electrical characteristics of a conductor
impedance (Z)
impedance is the total opposition to the flow of AC in an electrical circuit (resistance, capacitance, and inductance)
what is the opposition to current flow in a circut
inductive reactance (XL)
what is the angle between 2 similarly varying quantities ((sine-waves)
phase angle
what is the production of two or more phases of ac or of two or more alternating voltages of the same frequency
polyphase
what is the electronic device that converts ac to dc
rectifier
what is the ratio of the actual power dissipated in an electrical system to the input power of volts multiplied by amps
power factor
what sees basic terms/ direct current (DC)
resistance
what is the effective value of a sine-wave alternating current called
root means square (RMS)
RMS value is .707 of the peak value
what is alternating current wave form produced by a rotary generator
sine waves
