Ohm’s Law Tutorial and Power in Electrical Circuits

We may utilise Ohm’s Law to get the third quantity if we know two of the quantities (such as voltage, current, or resistance). There are several applications for Ohm’s Law; hence it is critical to know and memorise these formulae correctly to fully understand how Resistance forms the basis of Ohm’s Law.

V=IR

I=VR

R=VI

Using visuals might help you recall Ohm’s Law connection. There are three quantities of voltage, current, and resistance that are considered essential factors of Ohm’s Law. Each quantity plays an inevitable role in deciding Ohm’s Law formulations in various devices such as a transistor or resistor.

Circuits rely on electrical power.

Electrical power in circuits is the rate at which energy is absorbed or created within the circuit. The linked load absorbs the energy produced or delivered by the energy source, such as a voltage. Lighting and heating devices such as light bulbs and heaters use electricity to generate light or heat. 

The Watt is a unit of measurement and the value for power (P). Power is defined as the product of current and voltage. 

In this case, the equation for electrical power in circuits may be calculated by replacing V, I, and R according to Ohm’s Law as resistance forms the basis of Ohm’s Law:

P=VI

P=V2R

P=I2R

The Ohm’s Law power formulas are arranged to accurately reflect each quantity’s location.

Rating of electrical power

Every electrical device has a power rating which tells you how much electricity it requires to function. According to electrical power rating, watts are used to measure the amount of energy that can be converted from electrical power to other types of energy, for example, light, heat or motion. Take, for instance, a 1/3W resistor and a 400W light bulb.

Electrical gadgets are capable of transforming electrical energy into another. Electrical motors and generators, on the other hand, use mechanical force to generate electrical energy. 

Some electrical equipment, like electric motors, still retain an electrical power rating in the traditional valuation of Horsepower (hp). The value for calculating Horsepower in terms of Watts is 1hp = 746W.
2 x 746 = 1492W, which equals nearly 1.5kW for a two-horsepower engine.

Circuits flowing with electricity

Energy is expressed in Joules. When you allow energy to do work, such as releasing chemical energy stored in a battery into a resistor, this energy released per second is expressed as power. Power is the rate of doing work. One Watt spent in one second is one Joule. For example, we can calculate the total energy used in watt-seconds by knowing how much power is utilised and its duration. Power (voltage x current) equals energy (power x time). Power is the rate of doing work. One Watt spent in one second is one Joule. The watt-second or Joule is the unit of electrical energy.

The pace at which energy is transported may alternatively be characterised as electrical power. This means that “1 Joule/sec = 1Watt”. And electrical power can be defined as the pace of accomplishing work or the transfer of energy, which is one watt per second.

KWH is the unit of electrical energy if the electrical power used (or produced) is measured in kilowatts and the time is measured in hours rather than seconds (kW-hr). Using this method, the 8,640,000 joules produced by our 100-watt light bulb will be reduced to 2,400-watt-hours, or 2.4kWhr.

Power is the rate of doing work. One Watt spent in one second is one Joule. This is what the utility metre measures, and it is what we pay for when we get our power bills. The electricity metre in our houses uses kilowatt-hours as the standard unit of energy to determine the power consumed and, consequently, the amount to be paid. You have used 1 kWh of power when turning on a 1000-watt electric fireplace and leaving it on for an hour. One kilowatt-hour of power would be used if two electric fireplaces, each with a 1000-watt element, were lit for half an hour.

Conclusion

Ohm’s Law is extremely important for studying electric circuits. The single formula can be used to find the answers to a variety of sums. To determine the voltage, resistance or current of an electric circuit. Ohm’s law is used to maintain the desired voltage drop across the electronic components. Ohm’s law is also used in DC ammeter and other DC shunts to divert the current. 

The rate at which energy is converted from the electrical energy of the moving charges to some other form of energy like mechanical energy, heat, magnetic fields or energy stored in electric fields, is known as electric power. The unit of power is the watt. The electrical power can be calculated using the Ohm’s law and by substituting the values of voltage, current and resistance.