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DC & AC Introduction

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Questions and Answers

What is the primary difference between direct current (DC) and alternating current (AC)?

DC flows in one direction, while AC alternates its direction (correct)

DC is produced by batteries, while AC is generated by power plants

DC has a constant voltage, while AC has a varying voltage

DC is used for low-power applications, while AC is used for high-power applications

Which statement about the waveform of DC is true?

It has a constant amplitude over time (correct)

It has a sinusoidal shape

It alternates between positive and negative values

It has a square wave shape

What is the standard AC voltage and frequency used in North America?

120 V and 50 Hz

220 V and 60 Hz

220 V and 50 Hz

120 V and 60 Hz (correct)

What is the primary reason for using AC for high-power applications?

AC is easier to generate and transmit over long distances Signup and view all the answers

What is the unit of power?

Watt (W) Signup and view all the answers

What is the relationship between watts and joules?

1 watt = 1 joule per second Signup and view all the answers

What is the unit of electric power?

Watts (W) Signup and view all the answers

One horsepower is equivalent to how many watts?

746 watts Signup and view all the answers

What is the formula for calculating electric power using current and voltage?

All of the above Signup and view all the answers

If a light bulb is plugged into a 120-volt outlet and has a current of 0.7 amperes, what is its power rating?

84 watts Signup and view all the answers

If a heater uses 21 amperes when connected to a 110-volt line, and electric power costs 10 cents per kilowatt-hour, what is the cost of running the heater for 13 hours?

$23.10 Signup and view all the answers

What is the unit of energy consumption commonly used for electrical appliances?

Kilowatt-hours (kW·h) Signup and view all the answers