Use our **volts to watts calculator** is a tool that helps convert **voltage** in **watts** using conversion **Watt’s Law**, which states that **power** (P) in **watts** is equal to **voltage** (V) in **volts** multiplied by **current** (I) in **amperes** (amps).

`P (W) = V (V) x I (A)`

Imagine you have a

120-voltpower source and want to know how much power it can deliver to a device with aresistanceof10 ohms. Thevolts to watts conversionhelp you determine that the power output is1440 watts.

## Volts and Amps to Watts Calculator

Volts (V) Converted to | Amps (A) | Watts (W) |
---|---|---|

5 V | 1 A | 5 W |

5 V | 2 A | 10 W |

5 V | 3 A | 15 W |

5 V | 4 A | 20 W |

5 V | 5 A | 25 W |

12 V | 1 A | 12 W |

12 V | 2 A | 24 W |

12 V | 3 A | 36 W |

12 V | 4 A | 48 W |

12 V | 5 A | 60 W |

18 V | 1 A | 18 W |

18 V | 2 A | 36 W |

18 V | 3 A | 54 W |

24 V | 1 A | 24 W |

24 V | 2 A | 48 W |

24 V | 3 A | 72 W |

120 V | 1 A | 120 W |

120 V | 2 A | 240 W |

120 V | 3 A | 360 W |

120 V | 4 A | 480 W |

120 V | 5 A | 600 W |

220 V | 1 A | 220 W |

220 V | 2 A | 440 W |

220 V | 3 A | 660 W |

240 V | 1 A | 240 W |

240 V | 2 A | 480 W |

240 V | 3 A | 720 W |

240 V | 4 A | 960 W |

240 V | 5 A | 1200 W |

250 V | 1 A | 250 W |

250 V | 2 A | 500 W |

100 V | 1 A | 100 W |

100 V | 2 A | 200 W |

125 V | 1 A | 125 W |

125 V | 2 A | 250 W |

200 V | 1 A | 200 W |

200 V | 2 A | 400 W |

1000 V | 1 A | 1000 W |

1000 V | 2 A | 2000 W |

230 V | 1 A | 230 W |

230 V | 2 A | 460 W |

115 V | 1 A | 115 W |

115 V | 2 A | 230 W |

## Volts to Watts Conversion Formula

The formula for converting **volts** to **watts** is straightforward:

**P = V * I**

Where:

Pis power inwatts(W)Vis voltage involts(V)Iis current inamperes(A)

Let’s say you have a **12-volt** battery and a **6-ohm** resistor.

To calculate the power:

`P = (12²) / 6 = 144 / 6 = `**24 watts**

Consider a **24-volt** device that uses **3 amps** of **current**.

The **power** can be calculated as:

`P = 24 V x 3 A = 72 W`

This indicates that the device consumes **72 watts** of **power**.

## How To Convert Volts to Watts

Identify the Voltage: Determine thevoltageof the device involts(V).

Determine the Current: Find thecurrentinamperes(A) that the device uses.

Apply the Formula: Use the formula P = V x I to calculate thepowerinwatts.

With a **12-volt** battery that supplies **5 amps**, the calculation would be:

`P = 12 V x 5 A = 60 W`

The battery provides **60 watts** of **power**.

Suppose you have a **220-volt** power source and want to calculate the power consumed by a heater with a **resistance** of **44 ohms**.

Voltage (V) =

220 voltsResistance (R) =

44 ohmsP = (220²) / 44 = 48,400 / 44 =

1,100 watts

The heater consumes **1,100 watts** of power.

## What is 240 Volts in Watts?

**For a 20-ohm resistance**: P = (240²) / 20 = 57,600 / 20 =**2,880 watts****For a 50-ohm resistance**: P = (240²) / 50 = 57,600 / 50 =**1,152 watts****For a 100-ohm resistance**: P = (240²) / 100 = 57,600 / 100 =**576 watts**

To convert **240 volts** to **watts**, you need to know the **current** flowing through the circuit.

For example, if the **current** is **1 amp**, the **power** can be calculated as:

`P = 240 V x 1 A = 240 W`

If the **current** is **5 amps**, the calculation would be:

`P = 240 V x 5 A = 1200 W`

This means that at

240 volts, thepower consumptioncan vary significantly depending on thecurrent.

## How Many Watts is 18V?

**For a 2-ohm resistance**: P = (18²) / 2 = 324 / 2 =**162 watts****For a 5-ohm resistance**: P = (18²) / 5 = 324 / 5 =**64.8 watts****For a 10-ohm resistance**: P = (18²) / 10 = 324 / 10 =**32.4 watts**

To find out how many **watts** are in **18 volts**, you again need the **current**. For example, if a device operates at **18 volts** and uses **2 amps**, the **power** is:

`P = 18 V x 2 A = 36 W`

The **current** is **3 amps**, then:

`P = 18 V x 3 A = 54 W`

The **power** consumed by an **18-volt** device can range based on the **current** it draws.

## What is 5V in Watts?

**For a 1-ohm resistance**: P = (5²) / 1 = 25 / 1 =**25 watts****For a 2-ohm resistance**: P = (5²) / 2 = 25 / 2 =**12.5 watts****For a 5-ohm resistance**: P = (5²) / 5 = 25 / 5 =**5 watts**

For a device operating at **5 volts**, the **wattage** calculation depends on the **current**.

For instance, if it draws **1 amp**, the **power** is:

`P = 5 V x 1 A = 5 W`

It consumes **2 amps**, the calculation would be:

`P = 5 V x 2 A = 10 W`

This indicates that a **5-volt** device can consume between **5 and 10 watts** depending on the **current**.

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