# How to convert 15 amps to watts

How to convert electric current of 15 amps (A) to electric power in watts (W).

You can calculate (but not convert) the watts from amps and volts:

### 15A to watts calculation with voltage of 12V DC

For DC power supply, watts are equal to amps times volts.

watts = amps × volts

watts = 15A × 12V = 180W

### 15A to watts calculation with voltage of 120V AC

For AC power supply, watts are equal to the power factor times amps times volts.

watts = PF × amps × volts

For resistive load without inductors or capacitors, the power factor is equal to 1:

watts = 1 × 15A × 120V = 1800W

For inductive load (like induction motor), the power factor can be approximately equal to 0.8:

watts = 0.8 × 15A × 120V = 1440W

### 15A to watts calculation with voltage of 230V AC

For AC power supply, watts are equal to the power factor times amps times volts.

watts = PF × amps × volts

For resistive load without inductors or capacitors, the power factor is equal to 1:

watts = 1 × 15A × 230V = 3450W

For inductive load (like induction motor), the power factor can be approximately equal to 0.8:

watts = 0.8 × 15A × 230V = 2760W

### Watt definition

Watt is the unit of power (symbol: W).

In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m2⋅s−3 or, equivalently, 1 joule per second. It is used to quantify the rate of energy transfer.

The watt unit is named after James Watt, the inventor of the steam engine.

One watt is defined as the energy consumption rate of one joule per second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage of one volt.

1W = 1V × 1A

### Ampere definition

Ampere or amp (symbol: A) is the unit of electrical current.

The Ampere unit is named after Andre-Marie Ampere, from France.

One Ampere is defined as the current that flows with electric charge of one Coulomb per second.

1 A = 1 C/s

How to convert amps to watts »

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