The Difference Between Watts & VA But wait a minute. If an electrical device has only an amp rating and you want to know its wattage, simply multiply the amps by the voltage (most likely 120V). Wattage is simply volts multiplied by amps. Figure 2 shows some common ones.įigure 2 Wattage Many loads are rated in watts (W). You can tell by looking at an outlet what its voltage and amperage limitations are. Wiring problems are often related to too small a gauge wire being used, probably with the intent of saving money. 14 gauge could be used for 120V, 15A wiring of light fixtures and outlets. It's the same idea as shotgun shells, where 12 gauge is larger than 20 gauge.įor wire, No. Wire is measured by the term “gauge.” The smaller the gauge, the larger the wire. ![]() More amperage requires heavier wire to carry it. We have this safety precaution because trying to pull too much amperage can make the wiring heat up and cause a fire. Depending upon the age of the building, the switch is either a fuse or a circuit breaker. If you try to get or “pull” too much amperage from a circuit, there is a switch in the service panel that will open (switch off) to turn the circuit off. There also are 240V circuits rated from 30A to 60A. A larger wire can carry more amperage, like a larger pipe can carry more water.Īn ordinary 120V household circuit is rated at 15 amps (A). The rating is limited mainly by the size of the wire. Amperage rating is also called current rating. Amperage is a measurement of flow, or how much.Įvery circuit has an amperage, or amp, rating. Those settings are for direct current (DC).Īmperage Voltage is a measurement of pressure. The setting you wouldn't use is V DC or V with a straight line or dashed line over it. The squiggle stands for alternating current (AC). That may be represented on your meter as V~. Simply set the meter on V for voltage, and AC for alternating current. An inexpensive voltmeter or multimeter will tell you. If you're curious about the voltage in the building where you are, it's simple to measure. Pairs of red and black wires are usually used for 240V. This 240V electricity is available at the service panel. Over the years this standard has grown from 220V, to 230V, to 240V. An electric water heater or clothes dryer is standardized at 240V. These simply represent “standard line voltage.” Over the years, standard voltage has moved up from 110V to 120V. ![]() TE Relay Products offer a broad range of relays for application in many different markets.Sometimes you hear of 110V or 115V. ![]() Signal's Power Over Ethernet surface mount transformer series for use in a variety of applications Power over Ethernet (PoE) SMD Transformers – SPoE Series Taoglas’ antennas ensure high quality and seamless time-to-market execution for IoT products U-blox's SARA-R5 series modules offer long-term device availability and provide lifetime support. WISE-750-02A1E Intelligent Vibration Sensing GatewayĪdvantech's WISE-750 vibration PHM gateway is developed to perform predictive maintenance. TDK's power capacitors offer minimized losses at higher frequencies For theoretical calculation you can use the below mentioned formulas: Power = (Voltage) 2 ÷ Resistance Power = (Current) 2 x ResistanceģM™ TwinAx High Speed Cable Solutions: Thin, low profile cable with extremely tight bend radiiĪmphenol Communications Solutions connectors are tailored for emerging product designs What if you don’t have one of them or you have the resistance value of the circuit. Power (P) = Voltage (V) x Current (I)Īs, we know this calculator calculates the Power in Watts using the current and voltage value. ![]() Where, P represent Power, V represents Voltage and I represents Current. The formulas follow the Watts’s law triangle, By using this formula you can even calculate the voltage and current if you have the other two values. The Calculator works on the Watt’s Law formula given below: Power (P) = Voltage (V) x Current (I) Watt’s LawĪccording to the Watt’s Law the total power of the circuit is equal to the product of the current and voltage of the circuit. This calculator will help you in finding the value of the Power (in watts) of the circuit by using Voltage and Current value. You can also enter any two known values to calculate the third one, this way you can use it to convert Ampere to watts or voltage to watts or can also use it to convert Watts to voltage or watts to Ampere. Enter Current and voltage values to calculate the Power in Watts.
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