![]() ![]() Make a fraction of these numbers and find the final horsepower to amps value, 746 / 165.6 = 4.505 A. You can always convert a decimal to percent to make your life easier ( 90% = 0.9). Let's work out the result step by step using the appropriate horsepower to amps formula:Įstimate the power in watts (the nominator of the expression), 1 hp × 746 = 746 W.Įvaluate the product in the denominator, 200 V × 0.92 × 90% = 165.6 V. The engine's efficiency is 90%, while the power factor is 0.92. The engine's designed power is 1 hp, and it works with a voltage equal to 200 V. Let's say we want to find the current flow in an AC single-phase motor. You can find a more detailed description with examples in Omni's power factor calculator. The resistive-only loads result in values close to unity. PF is the power factor that tells us about the nature of the source. We can distinguish three different cases: The hp to amps calculations change a little for alternating current (AC). However, using our hp to amps calculator, you don't need to bother about unit conversion at all, as the tool converts between units automatically, so simply choose the one you work with! Here we are assuming you're using electrical horsepower (for mechanical horsepower, the factor is circa 745.7). A rule of thumb states that you should multiply the power in hp by 746 to get the power in watts. Knowing that we can write the hp to amps formula for direct current (DC) as:Īs the SI unit of power is the watt, it's common to use power converter before estimating the amperage. However, it changes a bit in real-life applications, as any power engine works with a certain efficiency, η. Question: 600W are being sent at 120V.According to Ohm's law, the output current I is a ratio of the power P and the output voltage V. Let's go through some examples to help nail the conversion process. Power supplied to homes and businesses uses AC supply. In Europe, the UK, East Japan and most of Australia, South America, Africa andĪsia, the current changes direction 50 times per second, which is 50Hz. In Northern America and Western Japan, this usually happens 60 times per second, or 60Hz / hertz. A flashlight with a battery uses a direct current.ĪC stands for alternating current, when the current periodically changes direction. North American homes typically use 120V for their electrical supply, whilst 230V is common acrossĭC stands for direct current, when the current flows in one single direction. In the hose analogy, the volts would be the water pressure. They measure the force required to make the electrical current (amps) flow. It uses increased water volume and higher water pressure the same applies to the wattage if amps and volts are increased. A water wheel would turn faster and longer, generating more energy if Multiplying amps (water volume) by volts (water pressure) gives you the wattage (the resulting power or energy). Watts represent the amount of energy produced by the amps and volts working together. In this analogy, the quantity (volume) of water would be the amps. It can be helpful to imagine electrical current as water in a hose. What are amps?Īmps are amperes, a unit which measures electrical current. To help understand the conversion of watts to amps, let's go through what each of these units represent. Advertisements Understanding watts, amps and volts ![]()
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