# Electric Current

## Electrons move through circuits to produce electric current.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Electric Current and Circuits

Covers electrical current, electrical currents, electrical power, and electrical energy.
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• Interactive Simulations

## Telegraph

Explore the concept of Morse Code and how signals are transfered over great distances by using telegraph machines based on electromagnets
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## Power Lines

Learn about the relationship between electric potential, current, and resistance in the context of high-voltage AC power lines
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## Electric Analogies

Explore a different way of thinking about electricity as a way to become familiar with the concept of potential, current, and resistance
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## Dollhouse

Learn about the analysis of parallel circuits in the context of a realistic household circuit.
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## Marquee Lights

Learn about different ways you can wire an electric circuit, and how the brightness of the lights depends on how they are configured.
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## Flashlight

Learn about electric circuits, the flow of current, electrical resistance, and electrical power dissipation by exploring the operation of a flashlight.
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## Physics - Electric Current

Explains the concept of current and its relationship to potential difference and resistance. Defines both alternating and direct current.
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## The Current

Explains electric current, resistance, Ohm's law, and Kirchhoff's circuit laws.
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## Guess The Efficiency

Learn about the efficiency of a light bulb.
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• Real World Application

## Batteries

How do batteries operate?
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• Real World Application

## Controlling Traffic In Real Time

Discover how traffic lights know when to change.
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