AC sine waves

What is the term for the effective value of an alternating current or voltage? This is the same as the DC current or voltage that delivers the same power.

• Average value
• Peak value
• Root Mean Square (R.M.S.) value
• Instantaneous value

What is the value of a sine wave at any given moment in time?

• Peak value
• Average value
• R.M.S. value
• Instantaneous value

Which term, shown in the image, refers to the maximum value reached by an AC waveform during one cycle?

• Instantaneous value
• R.M.S. value
• Average value
• Peak value

What is the measure of the full range of an AC waveform, shown in the image, from its negative peak to its positive peak?

• R.M.S. value
• Average value
• Instantaneous value
• Peak-to-peak value

What is the term for how long it takes for a sine wave to complete one full cycle?

• Instantaneous time
• Periodic time
• Frequency
• Peak time

What is the term for the number of full cycles a sine wave completes in one second?

• Average frequency
• R.M.S. frequency
• Periodic time

• Frequency

If the frequency of a sine wave is 50 Hz, what is the periodic time?

• 0.05 s
• 0.02 s
• 20 s
• 0.5 s

If the peak voltage of an AC suply is 10 V, what is the R.M.S. voltage?

• 10 V
• 7.07 V
• 5 V
• 20 V

If the peak-to-peak AC voltage is 20 V, what is the peak voltage?

• 10 V
• 40 V
• 30 V
• 20 V

What unit is used to measure frequency?

• Hertz

• Joule

• Second

• Watt