NAVEDTRA 14174A, NEETS Mod. 2, Ch. 4 Flashcards
What are two things that are in step, going through a cycle together, falling together and rising together said to be in?
Phase
Which word is a very simple memory aide that is used to remember the relationship of voltage and current in an inductive circuit?
ELI
The voltage-current phase relationship in a capacitive circuit is exactly opposite to that in what?
Inductive circuit
The opposition which a capacitor offers to AC is inversely proportional to frequency and capacitance. What is this opposition called?
Capacitive reactance
AC circuits containing reactance also contain resistance, the two combine to oppose the flow of current. What is this combined opposition by the resistance and the reactance called?
Impedance
Which symbol is used to represent impedance?
Z
By how many degrees from that in a purely resistive circuit will the voltage in a purely reactive circuit differ in phase?
90
When current is out of phase with the voltage, the power indicated by the product of the applied voltage and the total current gives only what is known as what?
Apparent power
Which symbol is used to represent phase angle?
Theta
Which type of power appears to the source because of the circuit impedance?
Apparent power
Which number (represented as a decimal or a percentage) represents the portion of the apparent power dissipated in a circuit?
Power factor
What is the easiest way to find the power factor?
Find the Power angle cosine
Which formula is used to determine the total reactance of a series AC circuit?
X = XL − XC or X = XC − XL
What are the formulas derived for Ohm’s law used in AC?
E = IZ and I = E/Z
What is the power dissipated across the resistance in an AC circuit called?
True power
