Electric Current

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I: current (A), q: charge (C), t: time

Ohm's Law

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U: electric potential difference between the ends of the resistor R

Work Created By A Current (Joule's Law)

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Electrical Power

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Resistance

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ρ: resistivity of the material (Ωm), l: length (m), A: cross-section area (a²)

Series Circuits

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Parallel Circuits

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Work Or Heat Energy Produced By A Resistor

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Power Consumption Of A Resistor

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Electromotive Force Of An Electrical Generator

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W: work of force (J), q: charge(c)

Generators In Series

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r: internal resistance of the generator

Generators In Parallel

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Generators In Series-Parallel

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Work And Power Of Generator

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H: Efficiency of genarator