Electrical Circuits: Ohm's Law

What is the relationship between voltage and current in a conductor according to Ohm's Law?

What is the unit of measurement for resistance?

What is the mathematical representation of Ohm's Law?

What is the opposition to the flow of electric current called?

What is the application of Ohm's Law in electrical engineering?

What type of materials does Ohm's Law not apply to?

If the voltage across a conductor is 12V and the current flowing through it is 2A, what is the resistance of the conductor?

What is the unit of measurement for current?

If the resistance of a conductor is 3Ω and the current flowing through it is 4A, what is the voltage across it?

Ohm's Law

Ohm's Law is a fundamental principle in electricity that relates the voltage, current, and resistance of a conductor.

Definition

Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance of the conductor.

Mathematical Representation

Ohm's Law can be mathematically represented as:

I = V/R

Where:

I is the current in amperes (A)
V is the voltage in volts (V)
R is the resistance in ohms (Ω)

Key Concepts

Resistance (R): The opposition to the flow of electric current, measured in ohms (Ω).
Voltage (V): The potential difference between two points, measured in volts (V).
Current (I): The flow of electric charge, measured in amperes (A).

Applications

Ohm's Law is used to calculate the voltage, current, or resistance of a circuit.
It is widely used in electrical engineering, electronics, and physics.

Limitations

Ohm's Law only applies to conductors that obey the law, such as metals.
It does not apply to non-ohmic materials, such as semiconductors or superconductors.

Examples

If the voltage across a conductor is 10V and the resistance is 5Ω, the current flowing through it can be calculated using Ohm's Law: I = 10V / 5Ω = 2A.
If the current flowing through a conductor is 3A and the resistance is 2Ω, the voltage across it can be calculated using Ohm's Law: V = 3A × 2Ω = 6V.

Understand the fundamental principle of Ohm's Law, its definition, mathematical representation, key concepts, applications, and limitations. Learn how to calculate voltage, current, and resistance in electrical circuits.