# What is Ohm's Law?

Are you curious about how electricity works?

Let me introduce you to a very important concept in electrical engineering called Ohm's Law. It's named after Georg Simon Ohm, a German physicist who discovered it in the early 19th century. Don't worry, though – we won't go too much into the history of it.

Ohm's Law is a very simple formula that helps us understand the relationship between voltage, current, and resistance in an electrical circuit. Before we dive into the formula, let's understand the basic components of an electrical circuit.

An electrical circuit has three components: a source of electricity, a conductor to carry the electricity, and a load that uses the electricity. For example, a flashlight has a battery (the source), wires (the conductor), and a bulb (the load).

Now, let's talk about voltage. Voltage is the force that pushes the electricity through the conductor. Think of it like water flowing through a pipe – the pressure of the water is like the voltage in an electrical circuit. Voltage is measured in volts (V).

Next, we have current. Current is the flow of electricity through the conductor. It's measured in amperes (A) and is like the amount of water flowing through the pipe.

Finally, we have resistance. Resistance is anything that makes it harder for the electricity to flow through the conductor. It's measured in ohms (Ω). Think of it like a clogged pipe – the more clogged the pipe is, the harder it is for water to flow through it.

Now that we understand these three components, let's look at the formula for Ohm's Law:

V = I x R

This means that voltage (V) equals current (I) multiplied by resistance (R). In other words, the voltage in an electrical circuit is directly proportional to the current flowing through it and inversely proportional to the resistance of the circuit.

Let's use an example to illustrate this. Imagine we have a flashlight with a 1.5-volt battery and a bulb with a resistance of 5 ohms. Using Ohm's Law, we can calculate the current flowing through the circuit:

I = V/R I = 1.5/5 I = 0.3 A

So the current flowing through the circuit is 0.3 amperes.

In summary, Ohm's Law helps us understand the relationship between voltage, current, and resistance in an electrical circuit. By knowing this relationship, we can design and build all sorts of electrical devices, from simple flashlights to complex electronic gadgets. So, the next time you turn on a light switch, remember that it's all thanks to Ohm's Law!

9th Mar 2023

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