Quiz sobre Corrente Alternada

Alternating current is characterized by:

• Only circulates in one direction.

• Maintains a constant value over time.

• Varies in direction and intensity cyclically.

• Is equal to direct current.

The period of a sine wave is:

• The maximum voltage value.

• The number of cycles per second.

• The time required for a complete cycle.

• The distance between two negative peaks.

The unit of frequency is:

• Volt

• Ampere

• Ohm

• Hertz

A frequency of 50 Hz means:

• 50 cycles per second

• 50 peak volts

• 50 effective amperes

• 50 periods per minute

The peak voltage of a waveform is:

• The average of the positive values

• The difference between effective values

• The maximum value in one direction of the wave

• The sum of effective voltages

The peak-to-peak voltage is:

• Equal to the effective voltage

• Twice the peak voltage

• Always 230 V in AC

• The average between two cycles

The effective value of a sine wave voltage indicates:

• The average of negative voltages

• The value that produces the same thermal effect as DC

• Half the peak value

• The rise time of the wave

If the effective voltage is 230 V, the peak voltage will be approximately:

• 115 V

• 325 V

• 460 V

• 230 V

In a purely resistive circuit in alternating current:

• The current is ahead of the voltage

• The current is delayed

• The current is in phase with the voltage

• There is no current

What happens to the current in a capacitor with AC?

• It is constant

• It lags behind the voltage

• It leads the voltage

• It is always in phase