[Physics Class Notes] on Know The Relation Between Watt and Volt Pdf for Exam

Let’s suppose that there are two persons viz: P and Q, each of these is allocated a task of data analysis for a limited duration in which they have to fulfill the deadline. A person’s ability will be ascertained by how much time he takes. If person P meets the expectations of their hiring manager, he gets recruited into the company and if he does not, he fails.

So, here person P takes 2 hrs, while person Q takes 3 hrs, so here person P has more power than Q. 

Now, this person has ability but he needs a push, so that push or the driving force is the potential difference. 

 

Relationship between Watt and Volt

Watt is the SI unit of power while Volt is the SI unit of potential difference. The relationship and differences between Watt and Volt can be understood by carefully examining the differences between Power and Potential Difference. 

In terms of mathematical formulation, 

P = V*I 

Where, P = Power, V = Potential difference, and I = Current flowing between them

The relation between Watt and Volt can be thought of as direct, which means that Watt varies directly with the Volt. This implies the following:

• When the electric power in terms of Watt increases, there is a corresponding increase in the electric potential in terms of Volt while keeping the electric current constant.

• However, if the electric power Watts decreases, the electric potential in Volts decreases by the same amount, when the electric current is kept constant.

Difference Between Watt and Volt

How Does Wattage Work?

Watt: An electrical power is measured in Watts. Let’s take our hose analogy.

Imagine you are spraying water from the hose into a bucket. So, here power is the measure of how quickly the bucket is filling up. 

From the Watt and Volt equation, we understand that it is a straightforward concept that power is the product of electric potential measured in volts and the current flowing through the conductor in Amperes. So, the more the wattage, the brighter is the light. 

We might have seen that a 9 W LED bulb is brighter than a 6 W LED bulb. 

Now, talking about voltage:

How Does Voltage Work?

Voltage: A force that makes electricity move is the voltage and it is measured in volts.

Let’s consider a hose analogy:

Imagine that voltage is the pressure in the garden hose, even if the nozzle of the hose is turned off, the pressure still persists inside it. 

So, in relation to the electricity, even if we switch off the bulb (as the bulb is connected across the circuit), the voltage remains in the energized part of the circuit/ckt.

Volt and Watt Difference

Volt is the measure of the potential difference across the ends of the conductor or a conducting terminal of the wire.

Let’s have a look at equation (1):

 P = V * I

1 Watt  = 1 Volt * 1 Ampere

Or,

1 volt = 1 Watt/1 Ampere ….(2)

From eq (2), Watt is the rate at which the electrical work is performed when one ampere of current flows through the conductor on applying the potential difference of one volt across the ends of the conductor.

Now, let’s give a new meaning to the Watt and Volt Relation in terms of AC and DC:

Watt Volt Relation

Watt Related to Volt

The relation between Watt and Volt is direct. It means that Watt varies directly with the Volt. This implies the following things:

• When the electric power in terms of Watt increases, the electric potential in terms of Voltage increases by the same amount while keeping the electric current constant.

• However, when the electric power Watts decreases, the electric potential in Volts decreases by the same amount, while keeping the electric current constant.

Let us consider that there are two persons P and Q respectively, each of these is allocated a task of physical labour for a limited duration in which they have to fulfill the deadline. A person’s ability will be judged by how much time he takes. So, if the person P or Q meets the expectations of their hiring manager, he gets recruited into the company and if he does not, he fails.

Now, if person P does the work in 2 hours and Q does the work in 3 hours then we can ascertain that P has more power than Q. So the potential difference is the capacity created between two ends which has an empty space between them and Power is the actual energy that is transmitted between this space per unit of time. 

This is all about watt and volt and their relationship. Understand the definitions and concepts to realize how they are related and grab hold of this topic well.