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Power is the rate of energy consumption and is calculated by mutiplying voltage of the appliance by amps of current it draws. You say 140 volts - but I think you mean 220. I don't know what you mean by "cycle of 1/10," please clarify. So if the oven draws 8.5 amps (which seems low to me) and if it's really at 220 volts then the power consumed is 220 x 8.5 = 1870 watts. Over the course of an hour the total energy used would be 1870 watt-hours. Note that we talk about energy used in one hour, not power used (power is a measure of energy per unit time).
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