Question

Explain what AC and DC are. Why is AC used by electric utilities? Why is DC used in flashlights?

   Explain what AC and DC are. Why is AC used by electric utilities? Why is DC used in flashlights?

Inquiry into Physics

Inquiry into Physics

Vern J. Ostdiek,… 8th Edition

Chapter 7, Problem 30

Instant Answer

Solved by Expert Ankur S

06/26/2021

Step 1

AC stands for Alternating Current, which means the current varies with time in both magnitude and direction. It can be represented as a sinusoidal wave, where the current increases and decreases in magnitude and changes direction periodically. Show more…

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Explain what AC and DC are. Why is AC used by electric utilities? Why is DC used in flashlights?

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Key Concepts

Alternating Current (AC)

Alternating current is an electrical current that regularly reverses direction, typically following a sinusoidal waveform. This characteristic allows for the efficient use of transformers to step up or step down voltage levels as required, enabling effective long-distance power transmission and distribution by minimizing energy losses. These features make AC the preferred choice for electric utilities in supplying energy over extensive power grids.

Direct Current (DC)

Direct current is an electrical current that flows consistently in one direction, providing a steady and constant voltage. This reliable and unidirectional flow is particularly well-suited for battery-powered devices, where maintaining a consistent power output is crucial for the stable operation of electronics. As a result, DC is commonly used in applications such as flashlights and other portable devices.

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