مراجعة الوحدة الثالثة

AC stands for

• Air-conditioner

• Direct Current

• Alternating Current

• Alternating Voltage

Battery is

• AC source

• DC source

• none of the above

• all of the above

In a circuit containing resistance only, the voltage and current are ____________________ with one

another.

• together

• anti phase

• in phase

• full rotation

The current in an inductive circuit _____.

• is faster than the voltage

• is the same as the voltage

• lags the voltage

• counteracts the voltage

When frequency decreases, capacitive reactance _____.

• increases

• decreases

• remains the same

• may increase or decrease

Tags

NGSS.HS-PS4-1

Which of the following is true of the current in a capacitive circuit?

• It leads the voltage.

• It lags the voltage.

• It is the same as the voltage.

• It counteracts the voltage.

The power factor can be defined as the ratio of true power to _____.

• apparent power

• total resistance

• total current

• reactive power

Tags

NGSS.HS-PS2-5

Which one of the below AC parameters show the effective Dc value?

• Peak Value

• RMS value

• Peak to peak value

• Frequency

A sine wave has a peak value of 354 V, What is the RMS value?

• 250 V

• 500 V

• 354 V

• 200V

A power supply has a peak value of 433 Volts sine wave, what is the effective dc voltage of this power supply?

• 306 V

• 433 V

• 612 V

• 220 V