# Ohm's Law and Light Bulb Resistance Calculation

## How can Ohm's Law be used to calculate the resistance of a light bulb in a series circuit?

Given that the current in a series circuit containing a light bulb is 2.05 A and the potential difference across the light bulb is 10.9 V, what is the resistance of the light bulb?

## Calculating Light Bulb Resistance using Ohm's Law

Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance. Mathematically, it can be expressed as I = V/R, where I is the current, V is the voltage, and R is the resistance.

In this scenario, we are provided with a current (I) of 2.05 A and a potential difference (V) of 10.9 V across the light bulb. To find the resistance (R), we rearrange the equation to solve for resistance: R = V/I.

Substitute the given values into the formula:

R = 10.9 V / 2.05 A ≈ 5.32 Ω

Therefore, the resistance of the light bulb is approximately 5.32 ohms.

This resistance value indicates the light bulb's ability to resist the flow of electric current. A lower resistance allows a higher current to flow, while a higher resistance restricts the current flow. With a resistance of 5.32 ohms, the light bulb determines the relationship between current and voltage in the circuit.

## Understanding Ohm's Law and Light Bulb Resistance

Ohm's Law is a fundamental principle in electricity that relates the current, voltage, and resistance of a circuit component. By applying Ohm's Law, we can determine how the properties of a circuit element, such as a light bulb, interact with each other.

In the case of the light bulb in a series circuit, the given current of 2.05 A and potential difference of 10.9 V allowed us to calculate the resistance of the light bulb as approximately 5.32 ohms. This resistance value plays a crucial role in determining the behavior of the light bulb within the circuit.

When an electrical potential is applied across the light bulb, a current flows through it based on its resistance. A lower resistance value, like 5.32 ohms in this case, allows a higher current to flow, resulting in a brighter light output. Conversely, a higher resistance would limit the current flow, leading to dimmer illumination.

Understanding the resistance of circuit components, such as light bulbs, enables us to design and optimize electrical systems effectively. By applying Ohm's Law and calculating component resistance, we can ensure proper functioning and efficiency in various electrical devices and circuits.