AC Final Exam

A transformer has a secondary with a voltage of 20V across a 100 ohm load.  It has a primary voltage of 10 volts.  What is the primary current?

(INCLUDE UNIT OF MEASUREMENT!)

The peak voltage multiplied by .707 gives us

• average voltage

• rms voltage

• no usable information

• 
  instantaneous voltage

A transformer has a 1:4 ratio.  It has 40 volts at 2 amps at the secondary output.  What is the current input to the primary

(INCLUDE UNIT OF MEASUREMENT!)

On an oscilloscope the Y axis plots the time domain

• True
• False

What is the AVG voltage of this waveform?  Assume a 2 V per division and a 5uS per division

Inductance is measured in

• 
  henrys

• farads

• 
  ohms

• hertz

The peak to peak voltage multiplied by .637 gives us

• avg

• no usable information

• rms

• 
  instantaneous

What is the peak voltage of this waveform?  Assume 5 volts per division and a 1uS per division setting

An AC waveform is always a sine wave

• True
• False

When analyzing an AC circuit it is not important to distinguish between RMS , Peak , Peak to Peak or Avg

• true

• false