Calculate Power in Series and Parallel Circuits (NEET Physics)

Calculating Power in Series and Parallel Circuits

Power can be understood as the rate at which work is done, measured in watts (W), which is equivalent to joules per second (J/s). Another unit for power is horsepower (hp), roughly equal to 745.7 watts, commonly used for describing the power of engines and machinery.

Step-by-Step Explanation:

In a series circuit, all components are connected in a single pathway, meaning the same current flows through each component.

To calculate total power in a series circuit, sum the power dissipated by each resistor. This can be expressed as:

[latex]P_T = P_1 + P_2 + P_3 + \ldots + P_n [/latex]

For example, consider a series circuit with resistors of 5 ohms, 10 ohms, and 15 ohms.

In a parallel circuit, the voltage across each branch remains constant, equal to the source voltage. The current flowing through each branch is inversely related to its resistance.

The equivalent resistance [latex]R_e[/latex] for series and parallel circuits can be calculated using the following formula for power:

[latex]P = I^2 R_e[/latex]

Where [latex]I[/latex] is the electric current flowing through the circuit. This equation can be used to determine power in both series and parallel arrangements.

Important Note:

The formulas for calculating resistance in series and parallel circuits stem from the principles of energy and charge conservation, which state that total energy and total charge remain constant in any electrical process. These foundational laws are essential for understanding various electrical behaviors and phenomena.