Are you interested in understanding Ohm’s Law? In this video, Electrician U breaks down the concept of Ohm’s Law and explains how it relates to voltage, current, and resistance. By using the chart “e-i-R-i,” which stands for voltage, current, and resistance, you can easily remember the three equations: e = I * R, I = e / R, and R = e / I. With these equations, you can solve for various unknowns in a circuit. For example, if you know the voltage and resistance, you can use Ohm’s Law to calculate the current that will flow. It’s a powerful tool for analyzing and understanding circuits. Check out the video to learn more about the applications of Ohm’s Law and how it can be used to solve different circuit problems.

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Ohms Law – EXPLAINED

Ohms Law is a fundamental concept in electrical circuits that establishes the relationship between voltage, current, and resistance. By understanding Ohms Law, you can make calculations and predictions about these variables, allowing you to solve problems and design circuits effectively. In this article, we will dive into the definition of Ohms Law, explore the three equations that form its basis, and provide examples of how to use Ohms Law in circuits.

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Definition of Ohms Law

Ohms Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. In simple terms, it means that the current flowing through a circuit is determined by the applied voltage and the resistance encountered by the current.

The Relationship between Voltage, Current, and Resistance

To understand Ohms Law better, let’s delve into the relationship between voltage, current, and resistance. Voltage is the potential energy difference between two points in a circuit. It is measured in volts (V). Current is the flow of electric charge, typically carried by electrons, through a conductor. It is measured in amperes (A). Resistance is the opposition to the flow of electric current and is measured in ohms (Ω).

The relationship between these three variables can be expressed through three equations:

e = I * R: This equation states that the voltage (e) across a resistor is equal to the current (I) flowing through it multiplied by the resistance (R).
I = e / R: This equation demonstrates that the current (I) flowing through a resistor is equal to the voltage (e) across it divided by the resistance (R).
R = e / I: This equation shows that the resistance (R) encountered by the current flowing through a circuit is equal to the voltage (e) across the circuit divided by the current (I) passing through it.

These equations are interconnected, allowing us to solve for any unknown values in a circuit.

Using Ohms Law in Circuits

Now that we have an understanding of Ohms Law and its equations, let’s explore how we can apply it in practical circuit scenarios.

Example 1: Finding current when voltage and resistance are known

Suppose we have a circuit with a voltage of 120 volts and a resistance of 6 ohms. We want to find the current flowing through the circuit. To solve this, we can use the equation I = e / R.

Using the given values, we can calculate the current as follows:

I = 120 volts / 6 ohms I = 20 amps

Therefore, when a voltage of 120 volts is applied across a 6-ohm resistor, a current of 20 amps will flow through the circuit.

Example 2: Finding resistance when voltage and current are known

In another scenario, let’s say we have a circuit with a voltage of 50 volts and a current of 10 amps. We need to determine the resistance encountered by the current. To do this, we can employ the equation R = e / I.

Using the given values, we can calculate the resistance as follows:

R = 50 volts / 10 amps R = 5 ohms

Hence, when a voltage of 50 volts is applied, and there is a current of 10 amps flowing through the circuit, the total resistance is 5 ohms.

Example 3: Using Ohms Law to solve for unknown values

There may be instances where you need to find an unknown value in a circuit, such as voltage, current, or resistance. By using Ohms Law equations, you can solve for these values.

To find an unknown value, identify it in the circuit and apply the corresponding equation from Ohms Law. You can rearrange the equation to isolate the unknown variable and calculate its value.

Conclusion

Understanding Ohms Law is essential for anyone working with electrical circuits. It provides a foundation for calculating and predicting voltage, current, and resistance in circuits. By applying Ohms Law, you can solve problems and determine unknown values in a circuit accurately. Whether you are an electrician, engineer, or hobbyist, mastering Ohms Law will enhance your ability to work with electrical systems effectively. So embrace Ohms Law and unlock the power of electrical circuits!