to strengthen your understanding of the concept of power measurement, reexamine figures 17-1,17-2, and 17-3. instantaneous load power in the product of load voltage times load current, and average power is the average of this product. one way to implement power measurement is therefore to create a meter whith a current sensing sircuit, a voltage sensing circuit, a multiplier circuit, and an averaging circuit. figure 17-24 shows a simplified symbolic representation of such an instrument.