DC vs AC

What are the differences between DC and AC?

Asked by Jenny on 23rd Oct 2022
Expert Trade Answers
"DC has the frequency 0 while AC has the frequency is 50Hz."
Answered on 23rd Oct 2022 - Member since Feb 2020 - report
"Direct current (DC) power, as you may suss from the name, is a linear electrical current—it moves in a straight line.

Direct current can come from multiple sources, including batteries, solar cells, fuel cells, and some modified alternators. DC power can also be "made" from AC power by using a rectifier that converts AC to DC.

DC power is far more consistent in terms of voltage delivery, meaning that most electronics rely on it and use DC power sources such as batteries. Electronic devices can also convert AC power from outlets to DC power by using a rectifier, often built into a device's power supply. A transformer will also be used to raise or lower the voltage to a level appropriate for the device in question.

Not all electrical devices use DC power, though. Many devices, household appliances, especially, such as lamps, washing machines, and refrigerators, all use AC power, which is delivered directly from the power grid via power outlets."
Answered on 21st Jul 2023 - Member since Jul 2023 - report
"Ac is Alternating Current and Dc is Direct current"
Answered on 24th Oct 2022 - Member since Aug 2022 - report
"Dc is Direct current and Ac is Alternating current"
Answered on 18th Jul 2024 - Member since Jul 2024 - report
"In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.

I hope that helps. Anything else I’m happy to help 🙂"
Answered on 23rd Oct 2022 - Member since Mar 2020 - report
"With DC (direct current), the voltage usually remains constant and the current flows in one direction only, actually from negative to positive as electrons are negatively charged.
DC cannot normally be stepped up or down using transformers that require a constantly changing current to work.

AC (alternating current) continuously reverses direction (50 times / second in UK domestic wiring ) neutral is usually 0 volts and the live cycles between positive and negative.
Less power is lost in the cables if electricity is tranmitted over long distances at high voltages so transformers are used to step the voltage up for transmission and down to safer voltages for end users. Transformers only work with AC, this is one of the main reasons that AC is used for mains power supplies.
Think of voltage as the pressure that is pushing the electricity through the cables and amps(current) as the amount of electricity that is actually flowing"
Answered on 24th Oct 2022 - Member since Feb 2020 - report
"Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically."
Answered on 23rd Oct 2022 - Member since Mar 2021 - report
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