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. According to Ohm's law, the output current I is a ratio of the power P and the output voltage V.
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