# How To Calculate Resistance In A Parallel Circuit

## How to Calculate Resistance in a Parallel Circuit

## Introduction A parallel circuit is a circuit in which two or more resistors are connected in parallel. This means that the current can flow through each resistor independently. The total resistance of a parallel circuit is always less than the resistance of any of the individual resistors. ## Calculating Resistance in a Parallel Circuit The formula for calculating the total resistance of a parallel circuit is: ``` Rt = 1 / (1/R1 + 1/R2 + ... + 1/Rn) ``` where: *

### Rt

is the total resistance of the circuit *

,

, ...,

### Rn

are the resistances of the individual resistors For example, if you have a parallel circuit with three resistors of 10 ohms, 20 ohms, and 30 ohms, the total resistance of the circuit would be: ``` Rt = 1 / (1/10 + 1/20 + 1/30) = 6.67 ohms ``` ## Calculating Current in a Parallel Circuit The current in a parallel circuit is the same through each resistor. This is because the voltage across each resistor is the same, and the current is inversely proportional to the resistance. The formula for calculating the current in a parallel circuit is: ``` I = V / Rt ``` where: *

### I

is the current in the circuit *

### V

is the voltage across the circuit *

### Rt

is the total resistance of the circuit For example, if you have a parallel circuit with a total resistance of 6.67 ohms and a voltage of 12 volts, the current in the circuit would be: ``` I = 12 V / 6.67 ohms = 1.8 amps ``` ## Calculating Power in a Parallel Circuit The power in a parallel circuit is the same as the power in a series circuit. The formula for calculating the power in a parallel circuit is: ``` P = I^2 * R ``` where: *

### P

is the power in the circuit *

### I

is the current in the circuit *

### R

is the resistance of the circuit For example, if you have a parallel circuit with a current of 1.8 amps and a resistance of 6.67 ohms, the power in the circuit would be: ``` P = (1.8 amps)^2 * 6.67 ohms = 21.2 watts ``` ## Conclusion Parallel circuits are used in a variety of applications, such as electrical distribution systems, electronic circuits, and lighting systems. By understanding how to calculate resistance, current, and power in a parallel circuit, you can design and troubleshoot parallel circuits effectively. ## Additional Resources * [Parallel Circuits](https://www.khanacademy.org/science/physics/electricity-and-magnetism/circuits/a/parallel-circuits) * [How to Calculate Resistance in a Parallel Circuit](https://www.electronics-tutorials.com/resistors/parallel-resistors.html) * [Parallel Circuits and Power](https://www.allaboutcircuits.com/textbook/direct-current/chpt-10/parallel-circuits-and-power/)

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