### Watt Calculator:

A watt is defined as a unit of power. It is the work rate when a current of one ampere flows through a conductor with a potential difference of one volt.

To learn how to calculate watts in a circuit by type of current, check out our Watts Amps Calculator.

Get a step-by-step process for calculating volts, amps, watts, and ohms in a circuit.

The calculator does all the work for the tools and produces the result easily and quickly.

Below are the steps to calculate Watts, Amps, Ohms in a circuit. Follow these rules to check power value easily.

- Obtain resistance and voltage values.
- Divide the voltage by the resistance to get the current.
- Multiply the voltage and current to check the power value in watts.

### Watt’s Equation:

Watt’s equation is power P_{(w)} in watts is equal to the voltage v_{(v)} in volts and multiply the current I_{(A)} in Ampere.Hence the watt’s equation can be written as

P_{(w)}= v_{(v)} *I_{(A)}

In an electrical circuit , a watt is stated as the product of volt and amp

### Derivation:

Ohm’s law

Ohm’s law states that the voltage across the conductor is proportional to the current flowing it

V=I*R

Power is the rate of change of electrical energy per unit time. Its unit is watt.

Voltage is the potential difference between two points on a conductor. Its unit is volt.

Current is the quantity of electrons passing any point in a conductor per unit time. Its unit is ampere.

Resistance is the strength of a wire against the flow of electrons. Its unit is Ohm.

### Resistance:

R= v/I

R = V^{2} /P

R= P / I^{2}

Voltage

V=I*R

V=P/I

V = √(P* R)

Electric current

I= v /R

I=P/V

I=√ (p/R)

Power

P=v*I

P=v^{2} /R

P= I^{2 *} R

Where

R= is the resistance

I=is the current

P=is the power

V= is the voltage

### Example:1

If 150 watt light bulb with 250 volts of electrical potential, then find the current and resistance of the bulb?

### Answer:

Given that

Voltage v= 250 v

Power P= 150 w

Current I= p/v

I=150/250

I=0.6A

Resistance R =V /I

R=250 /0.6

R=416.66Ω

Therefore, the current and resistance is 0.6 A , 416.66Ω

### Example:2

Calculate the voltage 80v and current 73A.Find the p value?

### Answer:

V=80v

I=73A

By using formula

P=V*I

P=80*73

P=5840 watt