How can calculate watts

Sherlock Ohms. Not Helpful 49 Helpful If I drove my Tesla for 1, miles and the power company charges 0. Not Helpful 2 Helpful How do I calculate the wattage of a soldering iron with a hot resistance 4K ohm and an operating voltage of V? Not Helpful 19 Helpful Need info to determine what size generator to buy. Best would be to contact the manufacturer of your AC. To get running watts, you could use a clamp-on ammeter to get the current draw on each leg and then calculate the total watts.

The startup power is going to be more difficult, as you need a meter that can measure and record instantaneous current. There are devices that will do this from companies like Dranetz, but they are expensive; you may be able to rent one. Not Helpful 2 Helpful 7. Find the number of watts sometimes it can be found on the base of the bulb in small print.

Divide the watts by the voltage. The voltage will depend on where the bulb is being used. In the US, voltage is usually for the wiring to a household light fixture.

If you want to figure out the amperage of a bulb in a car, almost all cars use a volt battery. So, assuming the car is not rare or very unusual, you would divide by 12 volts. Not Helpful 1 Helpful 5. Include your email address to get a message when this question is answered. By using this service, some information may be shared with YouTube. Many electrical items continue to use power when they are turned off. This particularly true of anything that shows an LED light when it is off.

Helpful 12 Not Helpful Submit a Tip All tip submissions are carefully reviewed before being published. Putting too many devices on an inverter may result in low power to the devices. This can cause damage to them, or cause them to shut down. Helpful 25 Not Helpful If you pull too much power through an inverter, you risk the inverter burning out. Helpful 23 Not Helpful The numbers are only approximate, so if you want specific and accurate wattage readings you'll need to use a wattage meter.

Helpful 0 Not Helpful 0. Related wikiHows How to. How to. More References 2. Co-authors: Updated: May 6, Article Summary X If you need to calculate wattage for an electronic device, locate the amps and volts that the device uses on the data plate on the back of the device. Deutsch: Stromverbrauch berechnen.

Italiano: Calcolare la Potenza Elettrica. Bahasa Indonesia: Menghitung Watt. Nederlands: Vermogen berekenen. Thanks to all authors for creating a page that has been read 1,, times. But after 30 years, I don't trust my memory. A watt is a calculated unit for measuring electrical energy demand. If you know the volts and amps, you can calculate watts.

Carla Boulianne is an evolutionary biologist by training and freelance writer by passion. She thrills in exploring new topics through extensive research. How is Wattage Calculated? How to Change Electrical Amps to Watts. How to Convert 12 Volt Alternator to Volts.

DC Vs. AC Voltage. How to Size a Capacitor to an Electric Motor. Underneath we list all of these transformations:. Keep reading to see a couple of examples where we learn how to find watts and calculate amps from watts and volts! To use our watt calculator, all you need to do is input two numbers, and all the other fields will be filled on their own.

But, if you want to learn how to calculate these things by yourself, here are some examples that you might find helpful:. Let's consider a 60 Watt light bulb with Volts of electric potential.

How to calculate amps from watts and volts? Find the correct formula, and input the numbers in the correct places:. Let's look at another example. A resistor has a voltage of 4 volts and a resistance of 8 ohms. How to find watts? You need to combine both Ohm's and Watt's law. Then, you will get:. Would you like to challenge yourself a bit?