AC vs DC: Alternating Current and Direct Current

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Questions and Answers

In which scenario would using DC electricity be significantly advantageous over AC, considering the basic properties of each?

Utilizing a transformer to efficiently step up or step down voltage levels for different applications.
Creating strong inductive opposition in a circuit to limit current flow at high frequencies.
Powering long-distance transmission lines due to lower energy loss from skin effect.
Operating a device requiring a stable and constant voltage, while minimizing electromagnetic interference. (correct)

A circuit contains both a capacitor and an inductor. How will each of these components respond differently to AC versus DC current?

The capacitor blocks DC and passes AC, while the inductor offers high opposition to AC and low opposition to DC. (correct)
The capacitor blocks AC and passes DC, while the inductor offers high opposition to DC and low opposition to AC.
The capacitor and inductor both block DC but allow AC to pass at different frequencies.
The capacitor and inductor both block AC but allow DC to pass after an initial charging period.

Why is AC preferred over DC for long-distance power transmission, considering the functionality of transformers?

AC experiences less resistance in long cables, reducing energy loss during transmission.
AC can be easily stepped up to high voltages for efficient transmission and then stepped down for safe usage. (correct)
AC is less dangerous than DC, making it safer for widespread distribution.
AC does not produce heating effects in cables, preventing overheating and potential damage.

A high-frequency AC signal is passed through a conductor. Which phenomenon is most likely to occur, and what effect does it have on the current distribution?

<p>Skin effect, causing the current to concentrate near the surface of the conductor. (B)</p> Signup and view all the answers

An engineer is designing a safety system for an electrical device. Considering the relative dangers of AC and DC, which safety feature would be most effective at mitigating potential harm to the user?

<p>Using a grounded metal casing to redirect AC current away from the user in case of a fault. (C)</p> Signup and view all the answers

Flashcards

What is Alternating Current (AC)?

Current whose magnitude and direction change periodically.

What is Direct Current (DC)?

Current with constant direction; magnitude may change.

How do capacitors interact with AC and DC?

Capacitors allow AC to pass through while blocking DC.

How do inductors interact with AC and DC?

Inductors offer high opposition to AC and low opposition to DC.

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Which is generally more dangerous: AC or DC?

AC is more dangerous than DC.

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Study Notes

Difference between AC and DC

Alternating Current (AC)

Magnitude and direction change periodically
More dangerous
Bypassed by a capacitor
Inductor offers high opposition
Used in transformers
Shows only a heating effect
Shows skin effect

Direct Current (DC)

Direction always constant, magnitude may vary
Less dangerous
Bypassed by an inductor
Inductor offers opposition
Cannot be used in transformers
Shows three effects
Does not exhibit skin effect

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Description

Explore the key differences between Alternating Current (AC) and Direct Current (DC). This comparison covers characteristics like magnitude, direction, safety, and behavior in circuits. Learn about their applications in transformers and electrical effects.