The Electric Current:

Lesson 21.1 - The Electric Battery and Conventional Current

Lesson 21.2 - The Ohm's Law Formula

Lesson 21.3 - Voltage, Current, and Resistance

Lesson 21.4 - What is Voltage?

Lesson 21.5 - Electrical Formulas of Electricity

Lesson 21.6 - Volts, Amps, and Watts Explained!

Lesson 21.7 - Electric Current, Charge, Ohm's Law and Electric Power

Lesson 21.8 - Ohm's Law - More Practice Problems

Lesson 21.9 - Electric Power and the Cost of Electricity

Lesson 21.10 - Battery Capacity - Amp-hours, mAh, and Watt-hours

Lesson 21.11 - Resistivity and Resistance

Lesson 21.12 - Conductors and Insulators

Lesson 21.13 - The Resistor Color Code

​Lesson 21.14 - Internal Resistance, EMF, and Terminal Voltage

Lesson 21.15 - Drift Velocity and Current Density

Lesson 21.16 - Potential Difference Between Two Points in an Electric Field

Lesson 21.17 - Alternating Current vs Direct Current

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