AC CIRCUITS

Alternating current

A current that continuously changes its value from + to - in a cyclic manner

Direct Current

A current that continuously has one direction and does not change in value

Cycle

A complete change in value and direction of an alternating quantity

Frequency

The number of cycles per second expressed in hertz (Hz).

Period (T)

It is the time it takes to complete one cycle.

Wavelength (λ)

The length of one complete 1 wave or cycle or the distance traveled by the wave in one cycle.

Peak value

The maximum instantaneous value of a function as measured from the zero-volt level

Peak value

It s the maximum amplitude of the wave from the zero line

Instantaneous value

The value of alternating quantity at any instant is a quantity that has only magnitude.

Maximum value

Value attained by an alternating quantity during + or - half cycle.

Average Value

It is the average of all instantaneous values of half (either + or - ) cycle of alternating quantity.

Average value

It is the arithmetic average of all the values in a sine wave for one alteration or a half-cycle

Effective value or RMS value

It is the varying voltage or current. It is the equivalent DC (constant) value which gives the same effect.

Effective value or RMS value

It is the value of a sine wave at 45 degrees, which is 70.7% of the peak value.

Form factor

The ratio between RMS value and average value of an alternating quantity (Current or Voltage) is known as?

Peak factor

It is the ratio between maximum value and RMS value of an alternating wave.

An AC voltage is one that manually changes in?

Magnitude and periodically reverses in polarity.

Electromagnetic induction by Michael Faraday

AC came from the theory of?

Whenever the flux linking on a coil, an emf is induced

Electromagnetic induction states that…

Amplitude

The maximum value (either + or -) which an alternating quantity attains during one complete cycle