Watts' Law Work principle

There are many theories and laws present in the study of electronics that allow us to know how electronic components and electrical circuits work. So, Watt's Law is one of those laws mentioned by a Scottish chemist and engineer which is "James Watt". The name Watts' Law is taken after James Watt.

Watt's Law states the basic relationships within electronics such as the main relationship between quantities and power determined by Ohm's Law. If we understand these concepts, the study of electronics will become very simple. This article provides an overview of Watts' Law and its statement with examples.

What is Watts' Law?

Definition of Watts' Law: Watts' Law states that the relationship between different parameters such as; Voltage (V), current (I) and power (P) in the circuit. The energy inside the circuit is the product of voltage and current. Watts' law formula provides the main relationship between P (Watts), V (Volts) and I (amperes).

P = V * I (Power = Voltage X Current)

V = P / I (Voltage = Power / Current)

I = P/V (Current = Power/Voltage)

To understand the concept of Watts' Law, it is necessary to understand the following parameters.

voltage (V)

Voltage or "V" in an electrical circuit is the potential difference between two points. So basically any difference in electrical potential causes electrons to flow from a high voltage point to a low voltage point. Here, the unit of voltage is “V”.

current (I)

Current or "I" is the amount of electric charge flowing through a point within a circle at a specific time. The unit of current is the ampere (A), or "amp". When there is a potential difference within the circuit, only current will flow.

resistance (R)

Resistance is a restriction on the flow of current and can be measured in ohms or Ω. In an electrical circuit, it is a measure of a component's ability to restrict the flow of current. This law defines the main relationship between voltage, current, and resistance. The flow of current through a conductor is directly proportional to its voltage (I = V/R).

force (q)

Energy (P) is a component that can be used per unit time. Simply put, it is the sum of electrical energy transmitted per unit time. So, the unit of energy (P) is joules/sec or J/sec, and it is measured in watts (W).

The main difference between Watts Law and Ohm's Law (Watts Law vs Ohm's Law) is; Ohm's Law is the main relationship between R (resistance), V (voltage) and I (current) within a circuit. Watt's Law is the main relationship between P (power), V (voltage) and I (current).

These two laws can be combined to get useful formulas.

Ohm's law = V = IR => I = V / R => V = IR.

Substituting the above values into Watts' Law, we can get

P = I * IR => I2R

P = V * V / R => V2 / R.

From the above formulas, we can derive several formulas based on our requirements.

Watts' Law Triangle

Ohm's law and Watt's law both involve similar electrical quantities; So they can be easily combined to derive some useful equations. The basic equation of Ohm's law for power is reversed and provides the same equation with some combinations to discover different individual quantities.

Watts' Law Statement

Here, the electrical power in the circuit can be calculated by three possible formulas from the watt-law triangle above. If the measured power is positive, the device is using power. Similarly, if the measured power is negative, the component generates power.

The values that can be calculated using Power Triangle are;

P = I X V

I = P/V.

V = P / I

wheel ohms law

The wheel of Ohm's Law includes another variable such as power (P), which is expressed in watts. So power can be defined as the rate of power transferred through the circuit per unit time expressed in watts. The Ohm's law wheel integrates a PIE diagram using h Ohm's law.

Oms Le Circle

The wheel formula may seem complicated but it is as easy to use as the PIE chart.

In the graph, each quadrant includes different formulas that indicate the main relationship between two variables whether they are directly proportional or not. In each quadrant, we can find three formulas.

Determine what you are trying to solve for resistance, voltage, current, or power.

You need to check known values because you need at least two values

Explore the formula section of the wheel to find out the values.

While performing the calculations, compatible values should be used. For example, the kilo ohms should be changed to ohms; Milliampere (milliampere) should be changed to ampere (A).

Watts Law Problem Solving

1). Household light bulb is 60W Then the voltage applied to the light bulb is generally 110V/220V, so measure the current consumed.

We know that I = P / V = 60 W / 110V = 0.54 Amps

I = P/V = 60 Watts / 220 Volts = 0.27 Amps.

2). If the voltage of the light bulb is 110 volts and the power is 60 watts, what is the current?

Here, the lamp voltage and power are 100V and 50W compatible

Watts' Law Work principle