OK, efficiency for anything is power in divided by power out. Watt is the unit for power and for electricity, Watts = volts times amps. In the case of an appliance with a 15 amp max draw at 120 volts, the peak power required to operate it is going to be 15 x 120 or 1800 watts. Now that is PEAK draw, like when the A/C compressor first kicks on. Most of the time, it will draw less than 15 amps.
Back to efficiency....For that, we need a way to measure how much power output the device has. For that, we have another formula to find watts.... watts = force times distance divided by time. So if I'm running an electric winch to lift something, the power will be the weight of the load multiplied by how high it is lifted divided by how long it takes to lift it. No machine is 100% efficient as friction and heat will rob some of the power. Hope this helps
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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