Power is work divided by time. Work is force times distance. Take the force applied between the teflon and copper. Multiply by the coefficient of friction. That's the tricky part, but for wet teflon on copper, I'd start with 0.05 or so. The result will be the drag force. Now multiply by the speed (distance divided by time). The answer will have units of force * distance / time, which is the same as power. If you're working in English units, 1 horsepower is 550 ft-lbf/sec. In metric, things are much easier as 1 N-m/sec = 1 watt.
The coefficient of friction should be between 0.01 and 0.1, but the exact value depends on surface finish and temperature, among other things.
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