Watt and volt are two most commonly used key terms in physical sciences and branches related to the same. For someone who is at the beginning of exploring this subject, these two terms might be a bit confusing and they might stumble on questions like what is watt and volt? What is watt formula? How to convert volts to watts or watts to volts? How can we explain the difference between watt and watt hour? How to understand the relation between watt and volt? What is electricity watt that we often talk about in day to day life? What is the difference between watts and volts? Or how many watts in a volt are present? Don’t worry we got you covered! We will cover not just these questions but also the difference between volts and amps, relation between power, voltage and current, volts amps watts, relation between power and voltage.
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Before moving onto the volt and watt difference, we need to first define the term watt and volt.
Watt is a unit of measuring power. Watt is named after an eighteenth century Scottish inventor, James Watt. Watt is equivalent to kg⋅m2⋅s−3 and also equivalent to Joule/sec. The symbol of watt is W.
Also read -
Volt is a unit of measuring electric potential, electromotive force and electric potential difference; also called voltage. Volt was named after Alessandro Volta, an Italian physicist. Watt is used to measure the rate of energy transfer.
Watt formula
We could also define the term watt as the rate at which work is done when an object with constant velocity of one meter per second is held against an opposing constant force on one newton.
Watt = Joule / sec = Nm / sec = kg.m2 / s3
In electromagnetism, when a current of one ampere flows through a potential difference (voltage) of one volt, the rate at which electrical work is done is said to be one watt.
Thus, the volts amps watts formula can be written as,
Watts = volts x amps
This formula is used to convert watts to volts and explains the power and voltage relation. This is how we can replace volts and amps to watts. This also gives the relation between v and w.
1 W = V2 / Ω = 1 A2Ω
Here Ω is the unit of resistance.
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Volt formula
When an electric current of value one ampere expends one watt of power between two points of a conducting wire, the electric potential developed between these two points is said to be one volt. In other words, volt is the potential difference between 2 points that expend one joule of energy when one coulomb of charge passes through these two points. Volt can be expressed as:
V = J/C = kg.m2 /A.s3
Volt can also be expressed in ampere x ohm, Webbers / sec, watts / ampere, or Joules / coulomb.
Parameters | Watts | Volts |
Definition | SI unit of power. | SI unit of potential difference and electromotive force EMF |
Formula | Watts = volts x amps | V = Joules / Coulomb |
Unit | Power | EMF & voltage |
Symbol | W | V |
Measurement | Gives realistic measurement of power | Gives small portion of voltage from source |
Measurement difficulty | Difficult | Easy |
Measuring device | Power meter | Voltmeter |
Unit derived from SI units | kg.m2 / s3 | kg.m2 /A.s3 |
This table describes the difference between volt and watt. Now let’s discuss the difference between watts and amps and the difference between volts and amps.
Volt | Ampere |
SI unit of potential difference and electromotive force. | SI unit of current. |
Symbol is V. | Symbol is A. |
V = Joules / Coulomb | A = charge / sec |
Measured by voltmeter. | Measured by ammeter. |
In base unit it is kg.m2 /A.s3 | Ampere is the base unit itself. |
Also Read:
Watt | Ampere |
SI unit of power. | SI unit of current. |
Symbol is W. | Symbol is A. |
Watts = volts x amps | A = charge / sec |
Measured by Power meter | Measured by ammeter. |
base unit it is kg.m2 / s3 | Ampere is the base unit itself. |
Some conversions
These conversions give the relation between power voltage and current.
Also check-
NCERT Physics Notes:
To convert 1 volt into watt the following formula is used Watts = volts x amps.
Watt is a unit of measuring power. Watt is named after an eighteenth century Scottish inventor, James Watt. Watt is equivalent to kg⋅m2⋅s−3 and also equivalent to Joule/sec. The symbol of watt is W.
Watts = volts x amps is the formula used to establish a relationship between watts, volts and ampere. Since, volt is the SI unit of voltage and ampere SI the unit of current. The product of values of amperes and volts will be equal to watt or power of the system.
In electromagnetism, when a current of one ampere flows through a potential difference (voltage) of one volt, the rate at which electrical work is done is said to be one watt.
Thus, the volts amps watts formula can be written as,
Watts = volts x amps
This formula is used to convert watts to volts and explains the power and voltage relation. This is how we can replace volts and amps to watts.
Volt can also be expressed in ampere x ohm, Webbers / sec, watts / ampere, or Joules / coulomb.
To measure the apparent power in an electric circuit (usually AC circuits), the unit volt-ampere is used.
Power = work / time
Watt hour is the unit of work whereas watt is the unit of power.
One unit of electricity means one kilowatt hour of electricity.
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