AC Theory T1-2

The AC value of current that has the same heating effect as that value of DC is the:

• Average

• RMS

• instantaneous

• max

The frequency of a wave form is:

• cycles per second

• cycles per minute

• cycles per milli second

• cycles per 360 degrees

phasors normally

• do not represent real values

• rotate anti-clockwise

• do not have a direction

• rotate clockwise

which trigonometry equation is incorrect

• opp/hyp

• hyp/adj

• adj/hyp

• opp/adj

Total impedance is represented by

• Xl (ohms)

• Xc (ohms)

• Z (ohms)

• R (ohms)

In a series circuit what is the reference for a phasor diagram

• current (I)

• voltage (V)

if a value is said to be in phase what angle would it be drawn on a phasor diagram

• leading by 90 degrees

• lagging by 90 degrees

• 0 degrees on the reference line

which component produces a value that is drawn in phase

• resistor

• capacitor

• inductor

which notation indicates a current value on a phasor

• open arrow head

• closed arrow head

which symbol would not be used in an impedance triangle Pythagoras equation

• Xc

• Z

• C

• R