Ohm's Law and Circuit Basics

Study Notes

Ohm's Triangle

A visual representation used to calculate current (I), voltage (V), and resistance (R) in electrical circuits.

Ohm's Law

Establishes that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R).
Essential for beginners and engineers to calculate relationships in circuits.
Formula: ( I = \frac{V}{R} )

Electric Current

Describes the flow of electrons through a conductor.
Measured in Amperes (Amps); symbolized by "I."
An increase in voltage leads to an increase in current, while an increase in resistance leads to a decrease in current.

Voltage

Defined as the electric pressure that drives current flow.
Measured in Volts; represented by "V" or "E."
Higher voltage results in a greater current flow; lower voltage results in less current.

Current, Voltage, and Resistance

The three fundamental parameters in all electronic circuits.
Ohm's Law connects these parameters:
- Voltage (V) from batteries,
- Resistance (R) in resistors and wires,
- Current (I) resulting from the voltage.

Resistance

Represents the opposition to current flow.
Measured in Ohms (Ω); symbolized by "R."
Increasing resistance in a circuit results in decreased current flow.

Characteristics of Resistance

Good conductors (gold, copper, silver) have low resistance.
Good insulators (porcelain, glass, plastic) have high resistance.

Applications of Ohm's Law

Widely used in practical examples to demonstrate how changes in voltage and resistance affect current flow in various electrical components.

Description

Test your knowledge on Ohm's Law and the fundamental concepts of current, voltage, and resistance in electrical circuits. Understand how these elements interact through Ohm's Triangle and the formulas that govern them. Perfect for beginners and engineering students.