AC FUNDAMENTALS

Rotating a magnet near a conductor produces a current because

• The electrons are repelled and attracted due to the law of charges

• The current sine wave lags the voltage sine wave

• Flux is the electromotive force that pushes the electrons

• Voltage is constant in a parallel circuit

The strength of a generated voltage depends on three things. Which of the following is NOT one of them?

• The speed at which the magnetic lines of flux pass through the coil

• The size of the conductor

• The strength of the magnetic field

• The number of turns in the coil of wire

What is Frequency?

• Affects power factor in Delta systems

• Refers to phase sequencing

• Is the relationship between apparent power and true power

• Is the number of times a generator rotates in one second

RMS stands for root mean square and is

• Zero when the power factor is 100 percent

• A value of AC voltage produce the same amount of power as a like DC voltage

• A formula used to measure voltage in DC circuits

• Formula used to calculate the average load on a circuit at any given time

A sine wave can be defined as

• A graphical representation of apparent and reactive power in an AC circuit

• A graphical representation of what's happen to voltage AC circuit over time

• A graphical representation of a Delta or Wye system

• A graphical representation of how a three-phase motor rotates

In a series circuit, what remains constant throughout the circuit?

• Voltage

• Resistance

• Amperage

• Power

In a parallel circuit, what remains constant throughout the circuit?

• Voltage

• Resistance

• Amperage

• Power

Inductance can be increased by

• Increasing the conductor size

• Increasing capacitance in an AC circuit

• Coiling the conductor

• Reducing resistance

Which of the following does not cause opposition to the current flow?

• Inductive Reactance

• Capacitive Reactance

• Resistance

• VARs =volts, amperes, reactance

All of the customer-owned, three-phase motors on a distribution circuit spin in the same direction

• TRUE

• FALSE