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DC & AC Introduction

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Questions and Answers

Which statement accurately describes direct current (DC)?

The flow of charge is produced by an alternating voltage source.

The flow of charge is used primarily for low-power applications.

The flow of charge alternates its direction.

The flow of charge moves in a single direction. (correct)

What is the characteristic of an alternating current (AC) waveform?

The voltage alternates between positive and negative values. (correct)

The voltage is always negative.

The voltage is always positive.

The voltage remains constant over time.

What is the primary reason for using AC current in commercial circuits?

AC current is more suitable for low-power applications.

AC current is easier to generate and transmit over long distances. (correct)

AC current is more efficient for short-distance transmission.

AC current is safer than DC current.

What is the standard voltage and frequency of commercial AC circuits in North America?

120 V and 60 Hz Signup and view all the answers

What is the unit of power used to measure the rate at which energy is used or moves?

Watt (W) Signup and view all the answers

What is the rate at which electrical energy is converted into another form called?

Electric power Signup and view all the answers

Which formula represents the relationship between power, current, and voltage?

$P=IV$ Signup and view all the answers

What is the unit of electric power?

Watts Signup and view all the answers

How many joules are equivalent to 1 kilowatt-hour?

$3.6 \times 10^6$ J Signup and view all the answers

If a device has a power rating of 500 Watts and operates for 3 hours, how many kilowatt-hours of energy does it consume?

$0.5$ kW·h Signup and view all the answers