AC DC

What is the difference in frequency between the two currents?

• An Alternating Current has a frequency of 0hz, and a Direct Current usually has a frequency of 60hz.

• They both have a frequency of 60hz.

• An Alternating Current usually has a frequency of 60hz, and a Direct Current normally has a higher frequency.

• An Alternating Current usually has a frequency of 60hz, and a Direct Current has a frequency of 0hz.

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NGSS.HS-PS4-1

What type of electricity is used in our houses?

• Direct Currents

• Alternating Currents

What type of electric current moves from the positive polarity to a negative polarity and moves forward at all times?

• Direct Currents

• Alternating Currents

Which of these answer choices below is an example of how a Direct Current obtains its energy?

• Lights

• Television

• Computer

• Battery

What causes the movement of electrons in a Direct Current?

• Pulsed electrons on a wire.

• The alternating push of electrons along the wire.

• The steady pull of electrons along the wire.

What is the main difference between AC and DC in terms of electron flow?

• In AC, electrons flow in one direction; in DC, they reverse direction periodically.

• In AC, electrons reverse direction periodically; in DC, they flow in one direction.

• In both AC and DC, electrons flow in one direction.

• In both AC and DC, electrons reverse direction periodically.

Which device is commonly used to convert AC to DC?

• Transformer

• Rectifier

• Capacitor

• Inductor

What is the typical frequency of AC used in household power supply in the United States?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz

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NGSS.HS-PS4-3

Which of the following is a real-world application of Direct Current (DC)?

• Powering a refrigerator

• Charging a smartphone

• Operating a ceiling fan

• Running a washing machine

In an AC circuit, what does the term 'RMS' stand for?

• Root Mean Square

• Random Mean Square

• Real Mean Square

• Rotational Mean Square