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This article was co-written by Daniel Stoescu. Daniel Stoescu is an electrician, owner, and operator of Home Tech Sputions in Hampton, Virginia. With over ten years of experience, Daniel specializes in electrical wiring for civil, commercial and light industrial structures. The staff at Home Tech Sputions has a total of more than 40 years of experience, specializing in providing comprehensive solutions for civil electrical works.
There are 9 references cited in this article that you can view at the bottom of the page.
This article has been viewed 45,706 times.
There is a very simple equation to calculate the wattage of the device. All you need to know is the amps and volts of that device. Understanding what wattage means is very important as you will save money and energy as a result.
Steps
Use mathematical formula to calculate power
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Determine the capacity of the power source. You need to know the amperage and voltage of the power supply. To calculate power, use a simple multiplication formula. Amps are the amount of electricity consumed. Volt is electric potential difference.
- Power is equal to the amperage times the voltage. Simple as that! In other words, watt=am-pe X volts. Sometimes you will see the formula written like this: W=AX V. [1] X Research Source
- For example, if the amperage is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110 to get 330W (watts). The formula is: P=3A X 110V = 330 W (P stands for wattage).
- This is why watt is sometimes referred to as volt-amperes. Circuit breakers often have ampere symbols written on their handles. This is the maximum amperage that the breaker can withstand before breaking the circuit. You can also determine the number of volts and amps by reading the product label or instructions for use. You can look up the common specifications of the standard equipment (most small appliances and home lighting fixtures require 15-20 amps of power and larger appliances are 20 to 60 amps). However, most small appliances are rated at 120 volts and operate with amperage of 12 amps or less. Larger appliances such as stoves and tumble dryers require more electricity and are connected to circuits with voltages up to 240 volts and amperage that can be 20 to 40 amperes depending on the variety. element. Household electrical lines in Vietnam are usually 240 volts.
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Determine amps and volts in the same way. You can reverse the multiplication formula. For example, let’s say you have a 24-40 AC power supply. That means the power you have is 24 volts and 40 watts. [2] X Research Source
- The power it can provide is 1.6 amps. The formula used is 40-? X 24. So you divide 40 by 24 to get 1.6. [3] X Research Sources
- And here’s another reason why you should. Assuming you want to know the wattage of a ceiling fan, the sticker on the fan indicates the amount of current the fan uses. You can find out the voltage of the ceiling fan (by calling the manufacturer or searching online), multiplying the two numbers together and you will get the estimated capacity for the ceiling fan to work.
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Determine the power of the resistor. If you want to know the wattage of the resistor, you need to know the voltage (V) and the amperage (called I). This is called Ohm’s law. [4] X Research Sources
- The formula is the voltage multiplied by the amperage, expressed as follows: W=VX I. [5] X Research source . Sometimes you will see the formula written as P which stands for power.
- This formula gets more complicated if the power changes over time. It involves using the period to calculate the mean. Determining such a measurement is difficult, so it is recommended that you use a special device called a power meter to calculate it.
Use the tool to calculate the power
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Find computer software online. There are many websites that use computer software to determine capacity. They will prepare the recipe for you. [6] X Research Sources
- These sites often ask you to enter the number of volts and amps. Then, ask you to press the “calculate” button to get the power result.
- However, keep in mind that online computer software is not always accurate as each device is slightly different in terms of power requirements.
- Some sites provide the wattage you need if you click on the device type, such as a television or a desktop computer. Websites sometimes even have charts listing the wattage of appliances ranging from refrigerators to loudspeakers. [7] X Research Sources
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Checking devices. You can know the capacity of the device by looking up the data sheet.
- Find the spec sheet on the back of the device. The information listed can be the number of volts, amps, and watts required to power the device. You can find this information stamped on the back of the device. Or you can find the wattage on the device label. [8] X Trusted Source US Department of Energy Go to Source
- The power meter is attached to the device, letting you know exactly how much electricity is needed for the device to work. The capacity of the device may vary depending on the setting. For example, the music player consumes more power if the volume is increased.
Learn more about power
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Understand the importance of capacity. It is the amount of energy produced or consumed. Many utility companies will bill you based on energy consumption. Basically, wattage is the amount of power consumed by the device. [9] X Research Source
- Rated power is the amount of electricity required to keep the device running. For example, a refrigerator typically requires 500 watts of power to operate. You need to know the power consumption in your home if you want to save more energy, use more solar panels or use a generator.
- The power supply has AC and DC currents. AC means alternating current; The current continuously changes direction and is often used in homes or offices. DC is direct current, which means that current only flows in one direction. You’ll see this current used for things like rechargeable batteries. [10] X Research Source
- Starting power is the power required to start equipment by igniting the motor or compressor. For example, to start the motor and compressor of a refrigerator, we need 2,000 watts of power.
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Use electricity more economically. Power is the basic unit of energy (electrical, mechanical, or thermal). The reason capacity is important is because you can improve energy efficiency if you understand them.
- By reducing capacity, you will use electricity more efficiently and save money. Here is an example. Let’s say you buy a light bulb, one with 100 watts and the other 23 watts. If a 100-watt light bulb was cheaper, you’d think it’s worth buying. However, in the long run, it’s the 23-watt bulb that saves you electricity.
- Do a simple subtraction to determine the difference in power. In this case it’s 77 watts (100-23). Utility companies will bill you in kilowatts. To find the number of kilowatts, divide the number of watts by 1,000. Then multiply the number of kilowatts by the number of hours of electricity consumed. You will have kilowatts/hour. Next, multiply the number of kilowatt-hours by the purchase price of electricity. You will have the amount of electricity consumed every year.
- For example, you have 10 light bulbs. Each has a capacity of 100 watts. 10 X 100 = 1,000 watts. 1,000 watts divided by 1,000 = 1 kW. Let’s say you consume electricity for 2,000 hours. Thus, 1kW X 2,000 hours per year = 2,000 kWh. Let’s say the utility company charges 2,500 VND per kilowatt hour. You will take 2,000 kwh X 2,500 = 5,000,000 VND. That is the electricity used for your light bulbs all year round.
Advice
- Be sure to allow a small amount of “virtual” power for each device when plugged into the circuit/inverter. Many devices continue to consume power even when turned off. Especially those that display LED lights after turning off.
Warning
- Plugging in too many devices on one inverter can cause power shortages for those devices. This may cause them to fail or power off.
- If the power flowing through the inverter is too large, you run the risk of burning the inverter.
- The numbers are approximate only, if you want to know the specific and accurate wattage, you need to use the power meter. [11] X Research Source
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This article was co-written by Daniel Stoescu. Daniel Stoescu is an electrician, owner, and operator of Home Tech Sputions in Hampton, Virginia. With over ten years of experience, Daniel specializes in electrical wiring for civil, commercial and light industrial structures. The staff at Home Tech Sputions has a total of more than 40 years of experience, specializing in providing comprehensive solutions for civil electrical works.
There are 9 references cited in this article that you can view at the bottom of the page.
This article has been viewed 45,706 times.
There is a very simple equation to calculate the wattage of the device. All you need to know is the amps and volts of that device. Understanding what wattage means is very important as you will save money and energy as a result.
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