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Difference Between Watts and Volts for JEE Main 2024

Last updated date: 13th Jul 2024
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What is Watts and Volts: An Introduction

Power is measured in Watts, which are named after James Watt. It is the current flow of one amp with a voltage of one volt in terms of electromagnetism. Electric potential, electromotive force, and electric potential difference are all measured in units called volts. A direct relationship exists between watt and volt. This suggests that a change in watt value will correspond to a change in volt value.


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JEE Main

Topic Name:

Difference Between Watts and Volts

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Chapter-wise Difference Between Topics

A proportionate relationship exists between watts and volts. In other words, watts and volts are directly proportional. Which suggests that-

The electric potential in terms of volts increases as electric power in terms of watts does, maintaining a constant electric current.

Electric potential increases as wattage (electric power) decreases.

What are Volts?

When a current of one ampere (Amp) dissipates one watt of power across a conductor, there is a potential difference called a volt. For those of us without an electrical engineering degree, this probably has little meaning. So let's dissect it.

In order to power something like a light, charged electrons (current) must be forced through a conducting loop (between two points) by the pressure of a power source known as voltage. It is comparable to the pressure in a water line.

Voltage is essentially electrical pressure and is expressed in volts. Therefore, a volt (V) is just a way to measure voltage. The accumulation of electrons in one area more so than another results in voltage. Before a lightning strike, this occurs naturally in clouds, and it can also happen inside of you before erupting as a static electric spark. Electrical pressure accumulates inside the cloud or your body until it reaches a point where it can leak out to the lower voltage point.An electrical circuit formed by the ground and the cloud requires an extremely high voltage to complete.

How Much Voltage is Present in an Electrical Circuit?

  • Let's examine what this means in terms of the electricity we utilize on a daily basis. We'll start by thinking about the lighting in our house. 

  • A lightbulb will be marked with its voltage rating; in North America, lightbulbs used in homes will be 120 volts rated. The lightbulb is made to be connected to a circuit that is operating at that voltage rather than producing that voltage itself.

  • Volts are a measurement of the force of electricity entering a bulb from a battery or an electrical outlet. 

  • 120V, 130V, or very low-voltage bulbs like the 12V DC (direct current) LED lights that many of us use in our homes are some examples of standard voltages.

High Voltage Vs. Low Voltage

High Voltage:

Electricity is delivered over long distances using high voltage. A significant amount of power can travel over a long distance in some applications (like the high voltage power lines that deliver electricity to our homes).

Low Voltage:

Low voltage is considered anything under 50V (volts) of electricity. Standard low voltages are 12V, 24V, and 48V. Low voltage wiring doesn’t carry the same current as power outlets. For example, it’s used for doorbells, garage door openers, thermostats, alarm system sensors, audio-visual systems, and our RV LED lighting! 

What is Watts?

The standard unit of power or radiant flux in the International System of Units (SI) is the watt (symbolized W). It is derived from the defining constants of the standard, which are used to build the SI base units of kilogramme (kg), metre (m), and second (s). One watt equals one joule (J) per second, making the watt a unit of measurement for the rate of energy transfer over time:

W = J/s

The SI standard defines a joule in terms of kilogrammes, metres, and seconds as the common unit of energy or work:

J = kg∙m2∙s-2

By combining the two previously mentioned formulas, a watt can also be expressed as follows:

(kgm2s-2) = $W = \dfrac{J}{s}$ = kg∙m2∙s-3

  • Ohm's Law is Used to Calculate Power.

Power is inversely proportional to the square of the voltage divided by the resistance, denoted by the letter R and expressed in ohms (). Think about a circuit where the resistance, voltage, and current are all fixed. These three properties have a proportional relationship, according to Ohm's Law. According to law, resistance times current (in amps) times voltage equals voltage, as shown in the following formula:

V = AR

This formula can be used in conjunction with the wattage formula to include resistance in our calculations. The wattage formula must first be modified by multiplying both sides of the equation by V.

W = VA

A = W/V

This final equation shows the proportionality between power, voltage, and resistance by stating that one watt equals one volt squared divided by one ohm of resistance.

Differentiate Between Watts and Volts:

S no.






The SI unit for power is watt.

The SI unit for potential difference and EMF is volts.



The formula for a watt is Watts = Current*Volts.

The formula for a volt is volts = potential energy / charge.



Watt is a measurement of power.

Electromotive force and potential difference make up the unit of voltage.



Symbolically, W can represent Watt.

Volt can be symbolized by the letter V.


Difficulty in measurement

It requires the quantities of both voltage and current, determining watts is challenging.

It is very simple to take a reading of the voltage.



Watts offer a more accurate scale for Power. 

Volt gauges only a small portion of the power source's voltage.


Measuring Device

Power metres can measure Watt.

Voltmeters can measure voltage.


Power metres and voltmeters are the instruments needed to measure watts and volts, respectively.Watt facilitates comprehension of the rate of energy production or consumption. Volt is the unit of measurement for the power contained in an electrical unit's power source, from which current is sent through a conducting loop to enable them to carry out a specific function.

Competitive Exams after 12th Science

FAQs on Difference Between Watts and Volts for JEE Main 2024

1. How Does Watt work?

The total amount of energy used or produced by a device in a single second is known as a watt. According to the metric system, one watt is equivalent to one joule of electricity flowing per second.

2. How Does Voltage work?

The amount of energy that electrons use as they move from one end of the wire to the other is measured in voltage. The voltage will increase as the potential difference increases.

3. Describe Briefly The Relationship Between Volt and Watt.

Watt and volt have a varying relationship. In other words, watt and volt go hand in hand. Which implies that any change in the value of the watt will directly affect the value of the volt.

4. What Will Happens if Equipment Connects to the Wrong Voltage?

A specific rated voltage is required for a device or piece of equipment to operate properly. The incorrect voltage can interfere with the operation of equipment and have serious repercussions, such as a fire. 

5. What are the Volts of a Battery? 

Battery voltage is the amount of electrical potential a battery holds, measured in volts. Batteries vary from a few hundredths of a volt to many hundreds of volts, depending on battery size and construction.