Ohm’s Law is a fundamental law of Electrical Engineering. It has a large number of practical applications in almost all electrical circuits and electronic components. Here is a list of 5 Practical Applications of Ohm’s Law in our daily life that we usually come across in our real life.

Power Supplied to Electrical Heater

The electrical heater is a commonly used appliance in winters. Provided with the resistance of heater coil and applied voltage, We can calculate the power supplied to this heater. Let’s assume that resistance of heater coil is 5 ohm and input voltages are 120V. We can use the formula from Ohmic Wheel: P = V2/R to find the power, P = 1202/5 ohm = 2880 watt. This power can then be multiplied with time to calculate the electricity bill at our premises.

Speed Control of Conventional Fans

The speed control of conventional fans is achieved by using a potentiometer. A potentiometer is a variable resistance. A circular knob on the component can be rotated to achieve a variable resistance on the output terminals. For any specific value of input, we can calculate the resistance, current and thus power flowing through Ohm’s Law.

Design of Electronic Devices

Most electronic devices in our daily life such as Mobile phone chargers, Laptop chargers, Internal circuits of devices and DC Power supplies all require a specific amount of current. Using Ohm’s Law we can calculate the amount of resistance that would be connected in that circuit for achieving any specific value of current.

Design and Fabrication of Fuses

Fuses and circuit breakers are the protection components which connect in series with the electronic devices. Fuses/CB’s are usually rated in Amperes. The selection of fuse for any specific rating of the component is calculated by Using Ohm’s Law. For example, you have an electric kettle which has an internal element of 10 ohms. The applied voltages are 100V. Now using Ohm’s law the current comes out to be I = V/R = 100V/10 ohm = 10A. Now while designing Fuse you are required to keep the rating at 10A.

Design of Circuit Breakers

Same as above.