Electricity cost in mills per kilowatt hour (kWh) may be calculated, using the previously stated costing assumptions, by To get a simpler, more usable form for the cost equation (Eq. 1), a Taylor Series multivariable approximation can be made for deviations from the reference system values for P, A, R, and delivered power D. This allows electricity costs to be written as a linear function depending only upon four microwave parameters. From Table 1, the simplified cost equation can be written
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