Direct Current

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 difference between the movement of the two electrons between the two types of currents?

• There's no difference.

• An Alternating Currents electrons move in one direction while a Direct Currents electrons move back and forth.

• An Alternating Currents electrons move back and forth while a Direct Currents electrons move in one direction.

• An Alternating Currents electrons move back and forth while a Direct Currents electrons don't move at all.

Tags

NGSS.MS-PS2-3

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.

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 characteristic of Direct Current (DC)?

• It flows in one direction only

• It changes direction periodically

• It has a frequency of 60 Hz

• It is used in AC power lines

Which device is commonly used to convert Alternating Current (AC) to Direct Current (DC)?

• Transformer

• Rectifier

• Capacitor

• Inductor

Tags

NGSS.HS-PS3-3

In which of the following applications is Direct Current (DC) most commonly used?

• Household lighting

• Powering electric vehicles

• Powering large industrial motors

• Transmitting electricity over long distances

What is the unit of measurement for Direct Current (DC) voltage?

• Amperes

• Volts

• Ohms

• Watts