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How to Convert Watts to Amps

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April 10, 2024

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Conversion of Watts to Amps often leaves many people stranded. Unsure of what to do to get accurate results, they often go online. This article can be used for cable connection because we need accuracy.

Most appliances bought come with a well-labeled power rating. They can guide you on the amount of current drawn to power the equipment. They’ll guide the type of power generator to acquire if you need one.

Summary

The easiest way to convert between watts and amps is by using our chart below. For ease, here are the most common ones we get asked about and their conversions at 110v.

• 500 watts converts to 4.545 amps at 110v.
• 1,000 watts converts to 9.091 amps at 110v.

Continue reading

Getting wrong results on your calculations will lead to the purchase of cables that can’t withstand the current passing through them. If not detected early enough, it can leave your house burnt down or have your air conditioner spoiled in a few days.

Alternatively, wrong results will lead to the frequent acquisition of circuit breakers. Their function is similar to Idle Air Control Valve in vehicles to limit the current to be drawn. It’s done to prevent short-circuiting in your equipment.

The three main components used in Watts to Amperes calculation are often similar. Still, they are as different as MIG and TIG welding.

1. Current 

Current indicates the flow of electricity from one point to another. It’s the number of electrons that move from point A to point B in a second. Using a water-flow analogy, we could say the amount of water in a pipe that moves from one point to another. It’s specified in a period.

The unit of measurement for current is denominated A, as you will see in the calculations below.

2. Volts 

It measures the amount of force each electron is under or what causes electrons to flow. It is also known as potential difference. The difference in voltage between two points causes the movement between the two points.

Volts units of measurement are denominated V.

3. Power  

This shows the true measure of the amount of work done by electricity, represented by Watts. It’s denominated ‘W.’ It’s calculated by getting the product of volts and amperes.

Instances where this conversion will come handy

• When building a new house with new electrical breakers being installed
• Setting up new offices and factories
• In the electronic manufacturing industry
• The solar industry
• Vehicle manufacturing and design

To convert watts into amps, you need to follow the steps below:

How do you calculate the different values?

Just like you need a shoe size chart to convert the sizes, you need to find the Watts from Volts and Amps. The equation for calculating the various values can be seen below and each measure of the unit.

P=V*I

Where;

P represents electrical power in watts, W

V represents electrical voltage, and the conventional current for domestic use in the US ranges between 110v and 120v. Still, it can be as high as 220v for powerful appliances.

I represent currents in amperes, denominated ‘A.’

W=VA

We have included our calculator, which saves you time and the energy of committing to memorize the equation. You need to know the values to input, and you get the result.

Here’s a simple chart with some of the most typical combinations.

In the example below, we will illustrate finding the different amounts of Watts in a range of different examples. They’ll have different levels of amps and volts. They will be specified.

Example 1; 5A and 120v?

P=VI

V= 120v and I=5A

P= 120v * 5A

P= 600W

You can also try to input the values in our calculator to confirm whether the solutions are identical.

Example 2; 10 A machine draw if operating under 110v?

P= VI

I= 10A and V= 110V

P= 10*110

P= 1100W

How do you calculate it with voltage and resistance?

Like many other mathematical computations, other formulas can be expressed using different equations. They are introduced when you miss one variable but have a different one. However, you need to know what variables you have.

If you don’t have either voltage or amperes current, you can substitute either with resistance. It is a measure of opposition to the flow of electric current. Resistance is measured using units known as Ohms, Ω.

The mathematical formula for resistance is shown below. ‘R’ denominates resistance.

R=V/I

Where;

R represents the resistance in ohms, Ω.

V represents voltage.

You can derive the equations using voltage and resistance with the above formula, as shown below.

P=V*I

Also

R=V/I

The current I has not been provided. We can substitute it in the power formula with resistance. ‘R’ is resistance, as shown.

I= V/R

With “I” as the subject, we can replace it in the Power formula;

P=V* I

But

I=V/R

Thus,

P= V*V/R

P=V²/R

Where,

P is power in Watts, W.

V is Voltage.

R is resistance in Ohms, Ω.

It is important to note that you can key in the values and get similar answers with our calculator. You don’t even have to know the formula and derivations.

Example 3; 30Ω electric heater under 220v.

P= V²/R

P= 220*220/30

P= 1613 W

How do you calculate it with amps and resistance?

The equation involved in getting the watts using amps and resistance requires a similar derivation to the previous one. It requires current instead of voltage, as illustrated below.

P=VI

But

R=V/I

Thus,

V= IR

Replacing V in the equation; P=VI

P= I²R

Where;

P= power in watts, W.

R= resistance in ohms, Ω.

Alternatively, you can plot your values in our calculator to find the answer faster. It’s great if you are in a hurry or need to confirm what you have calculated.

Example 4; 30A current and a 5Ω resistance.

P=I²R

P= 30*30*5

P= 4500W

Example 5; Requirements to power a 25A heater with 10Ω resistance.

P=I²R

P=25*25*10

P=6250

How many watts are there in an amp?

Watts and amps are rarely fixed values in electrical computations. Getting to know how to compute while having the other is required to understand your power utility bills. It’s great to know why industries and heavy industries use 3-phase electricity. In contrast, we have single-phase power lines connected to our homes.

Single-phase electricity or electricity supplied to our homes by electricity power providers usually has a voltage between 110v and 120v. It is used by any appliance connected to electricity at home.

On the other hand, the electric current varies depending on the power. It’s measured in watts and indicates the current needed to run an electric device. The more the power needed, the higher the current drawn. Simply put current drawn is directly proportional to the power needed.

To determine the number, we first need to get the voltage for the system in question. Later we’ll use the formula or a calculator to compute and give the value almost immediately.

Derivation for the formula to get the number in an amp;

P=VI

For United States (USA) electric values, we shall assume that the voltage value is 110V.

Thus,

P=VI

Where V= 110v and I= 1A

Therefore,

P=110w

From the calculations, there are 110w in an amp in the USA given 110v.

In Britain, the electric voltage supplied to homes is usually 220V. The amount will change due to the change in voltage.

Taking the voltage to be 220V,

P=VI

Where,

V=220V and I=1V

P=220*1

P=220W

From the calculations, there are 220w in an amp in Britain.

Also, the number depends on the voltage of the system.

To get the same amount of power in the USA as Britain, the amps in the United States need to be increased considerably. It is shown below.

Watts in Great Britain= 220W. In America, it’s 110W

Remember, P=VI

Since we are using values from the USA, the value of V remains 110V.

V=110V

P=220W

Finding I from P=VI

P=VI

I=P/V

I=220/110

I=2A

Therefore, there are 220W in 2 amps in the USA.

For values in the USA, we have input a calculator that will automatically find the number you’re looking for.

Example 6; How many watts are there in an amp for a voltage of 120V?

P=VI

v=120v

I = 1A

P= 120*1

P= 120W

We could also work with a value greater than one to find the number of watts available, as you will see if you keep reading.

Example 7; 2 amps in a 110V system?

P=VI

V= 110V

And I = 2A

P= 2*110

P= 220W

This process of converting is a reverse process to the one we used before and depends on the formula—small modifications to the equation to enable you to find the required value.

Converting helps you find the current drawn to power your machine. It gives you guidelines on the cables and extensions that can support the power needed. Getting the wrong cable rating will melt cables due to a larger current passing than they can handle.

How to convert manually

We use the calculator provided to convert, which is easier. Here’s the formula to represent the equation.

P=VI

To convert, we have to find the value of I, as shown below.

I=P/V

It is important to note that the voltage value will be fixed depending on your working system. In our examples, we shall work with a value of 110V.

For example, Convert 500 Watts using a voltage of 110V.

P=VI

I=P/V

Where P=500Wand V=110V

Thus I=500/110

I=4.54A

Use the calculator provided to confirm whether our solution is right.

Example; Convert 600W and 110V system

I=P/V

P=600W and  V= 110V

I=600/110

I=5.45A

Example; How many Amps are there in 1000W?

I=P/V

P=100W

Let V=110V

I=1000/110

I=9.09A

Example; Convert 1200W, under a 110W system

I=P/V

P=1200W

V=110V

I=1200/110

I=10.90A

Example; Convert 1500W

I=P/V

P=1500W

V=110V

I=1500/110

I=13.63A

Example; Convert 2000W

I=P/V

P=2000W and V=110V

I=2000/110

I=18.18A

Example; Convert 3000W

I=P/V

P=3000W and V=110V

I=3000/110

I=27.27A

Example; Convert 5000W

I=P/V

P=5000W

V=110V

I=5000/110

I=45.45A

Amp hours to Wh

Ampere hours (Ah) are units used to indicate the number a battery can supply in an hour. It is calculated from the amount of time it takes for a fully charged battery to discharge at a given current. It is usually used as a measure of battery capacity.

On the other hand, Watts hours (Wh) indicate the amount of electrical work done by a system for an hour. It is the energy that has been used. If converted to Kilowatt-hours, Wh forms a unit power utility providers use to produce electricity bills.

To convert Ah to Wh, you multiply the Ah by the system voltage to get Wh.

Wh=Ah*voltage

Wh =Ah*V

Where can you expect to use these conversions?

• Car batteries lasting power
• Converting solar power into calculating how long your devices will last
• Calculating how long a device like embroidery machine will last on tubular LED acid battery.

For example; Find the Wh for a 12v battery with a capacity of 15Ah

Wh=Ah*V

Ah=15 and V=12

Wh=15*12

Wh=300A

Make sure to also check out our resources on the 2-cycle oil mix and metal thickness.