Electronics › lesson 02 of 100 · Beginner

Basic Electrical Concepts

The fundamental electrical quantities and units are the basis for understanding and working with electricity.

Consider a simple flashlight: it has a battery, a switch, and a light bulb. When the switch is closed, the battery supplies electric potential difference, or voltage, which drives an electric current through the bulb, making it light up. This is an example of the fundamental electrical quantities and units in action.

The three main quantities are voltage (measured in volts, V), current (measured in amperes, A), and resistance (measured in ohms, Ω).

Understanding these quantities and their units is crucial for working with electricity and electronics.

例

• A battery supplies 9V to a circuit.This is an example of voltage.
• A wire carries a current of 2A.This is an example of current.
• A resistor has a resistance of 100Ω.This is an example of resistance.

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