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HomeHomework HelpphysicsOhm's Law and Resistance

Ohm's Law and Resistance

Ohm's Law is a fundamental principle in electrical engineering that states the current through a conductor between two points is directly proportional to the voltage across the two points, with resistance as the constant of proportionality.

beginner
2 hours
Physics
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Overview

Ohm's Law is a fundamental principle in electricity that describes the relationship between voltage, current, and resistance. Understanding this law is essential for anyone studying electrical circuits, as it provides the foundation for analyzing how electricity flows through different components. B...

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Key Terms

Voltage
The electric potential difference between two points.

Example: A battery provides a voltage of 9 volts.

Current
The flow of electric charge, measured in amperes.

Example: A light bulb uses a current of 0.5 amperes.

Resistance
The opposition to the flow of current, measured in ohms.

Example: A resistor has a resistance of 100 ohms.

Ohm's Law
A formula that relates voltage, current, and resistance: V = IR.

Example: If V = 10 volts and R = 5 ohms, then I = 2 amperes.

Circuit
A closed loop through which electric current flows.

Example: A simple circuit includes a battery, wires, and a light bulb.

Series Circuit
A circuit where components are connected end-to-end, so current flows through each component.

Example: In a series circuit, if one bulb goes out, all bulbs go out.

Related Topics

Kirchhoff's Laws
These laws help analyze complex circuits by applying conservation of charge and energy.
intermediate
Capacitance
Capacitance is the ability of a system to store charge, important in circuits.
intermediate
AC vs DC Current
Understanding the difference between alternating current (AC) and direct current (DC) is crucial in electronics.
intermediate

Key Concepts

VoltageCurrentResistanceOhm's Law