Single-Phase Circuits

This set of flashcards covers key concepts from the lecture on Single-Phase Circuits, including definitions, principles, and circuit behavior.

An electric power system is usually a __ system that contains generators, transformers, transmission and distribution lines, and loads.

three-phase

A typical load in the power system draws __ at a constant power factor.

constant power

If the passive sign convention is obeyed, then if the power is positive, the element is __ power.

absorbing

If the power is __, the circuit element is supplying power like a generator.

negative

The power network utilizes voltage having a __ waveform.

sinusoidal

The __ is a complex representation of a time-invariant sinusoidal waveform.

phasor

The mean power calculation in a single-phase circuit is typically based on the __ of the instantaneous power.

average value

When two impedances are connected in __, the equivalent impedance is the sum of both impedances.

series

When N impedances are connected in __, the equivalent impedance is equal to the reciprocal of the sum of the reciprocals of each impedance.

parallel

__'s theorem states that an electric network can be represented by a voltage source and an impedance connected in series.

Thévenin

The __ power is measured in volt-amperes (VA).

apparent

In an inductive circuit, the current __ the applied voltage.

lags

The __ voltage is the difference between the voltage at the load terminals for the no-load and full-load conditions.

voltage regulation

The __ is a simplified schematic that portrays only the major components and interconnections between components of a circuit.

one-line diagram

The power factor is defined as the cosine of the __ angle.

phase

When elements in parallel only have __ voltage across them, the individual branch currents can be determined via the current divider equation.

the same

The __ is a graphical representation of the relationship between current and voltage in ac circuits.

phasor diagram

The __ power correction involves adding a capacitor in parallel to improve the power factor.

power factor

In AC circuits, the __ consists of resistive and reactive components.

impedance

The root mean square (rms) voltage of an AC source is useful for calculating the __ received by a load.

power

The __ of an inductor is proportional to the frequency of the current passing through it.

reactance