10 Questions
Which statement accurately describes direct current (DC)?
The flow of charge moves in a single direction.
What is the characteristic of an alternating current (AC) waveform?
The voltage alternates between positive and negative values.
What is the primary reason for using AC current in commercial circuits?
AC current is easier to generate and transmit over long distances.
What is the standard voltage and frequency of commercial AC circuits in North America?
120 V and 60 Hz
What is the unit of power used to measure the rate at which energy is used or moves?
Watt (W)
What is the rate at which electrical energy is converted into another form called?
Electric power
Which formula represents the relationship between power, current, and voltage?
$P=IV$
What is the unit of electric power?
Watts
How many joules are equivalent to 1 kilowatt-hour?
$3.6 \times 10^6$ J
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
Learn the basics of Direct Current (DC) and Alternating Current (AC). Understand the concept of charge flow direction, battery production, and electron movement in DC. Explore the characteristics of waveform and voltage over time in AC.
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