Practice # 6 AC Theory

When a conductor is moved through a magnetic field, an ________ is induced in the conductor.

• electromotive force (EMF)

• electro-galvanic current (EMC)

• electro-magnetic pulse (EMP)

• electrochemical reaction (ECR)

• electrostatic discharge (ESD)

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Whenever a voltage or current passes through a series of changes, returns to the starting point, and then again starts the same series of changes, the series is called a __________.

• cycle

• period

• alternation

The frequency is the number of __________________ of AC per second (1 second).

• cycles

• waves

• periods

• alternations

• pulses

Tags

NGSS.HS-PS4-1

The time required for a sine wave to complete one full cycle is called a ________________.

• alternation

• cyclic time

• period

The distance that a waveform travels during a period is commonly referred to as a __________.

• wavelength

• period length

• sine length

Tags

NGSS.HS-PS4-1

An ________________ of voltage or current is the induced voltage or current flowing at any instant during a cycle.

• intrinsic value

• average value

• induced value

• instantaneous value

• peak value

The ____________ is the largest instantaneous value.

• power value

• average value

• induced value

• peak value

• minimum value

The largest single positive value occurs when the sine wave of voltage is at 90°, and the largest single negative value occurs when it is at 270°. Peak value is 1.41 times the effective value. Regarding the above statements:

• Only #1 is true

• Only #2 is true

• Both #1 and #2 are true

Tags

NGSS.HS-PS4-1

Effective value is also known as the __________ value or root mean square, which refers to the mathematical process by which the value is derived.

• MRS

• SMS

• RMS

• AMS

• TMS

The effective value of a sine wave is actually a measure of the __________ of the sine wave.

• heating effect

• resistive effect

• frequency

• counter EMF

• amplitude