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

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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

How does voltage affect electrical currents?

• The voltage of an object has no effect on the current.

• If the voltage in the object increases the current will decrease.

• If the voltage in the object decreases the current will increase.

• If the voltage in the object increases the current will increase.

What is the primary 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 used to convert AC to DC?

• Transformer

• Rectifier

• Inverter

• Generator

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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Which of the following is a common application of DC?

• Powering household appliances

• Charging batteries

• Operating street lights

• Running large industrial motors

What is the main advantage of AC over DC for power transmission?

• AC is more efficient over long distances.

• AC is safer to use.

• AC is easier to generate.

• AC is more stable.