Internal Resistance Calculator

Calculate Internal Resistance





Formula

The formula to calculate the Internal Resistance (r) is:

\[ r = \frac{e}{i} - R \]

Where:

Internal Resistance Definition

Internal resistance is the total resistance to electron flow that arises from the internal structures of a circuit. It affects the efficiency and performance of electrical devices and is an important factor in circuit design and analysis.

Example Calculation

Let's consider an example:

Using the formula to calculate the Internal Resistance:

\[ r = \frac{12}{2} - 4 = 2 \, \text{Ohms} \]

This demonstrates that with an electromotive force of 12 Volts, a current of 2 Amps, and a load resistance of 4 Ohms, the internal resistance would be 2 Ohms.