Functions of components/blocks:
- CT reduces current to reasonable value for current scaling network. - Voltage & current scaling networks reduce proportionally the voltage & current to values suitable for the analog multiplier. - Analog multiplier gives a dc voltage proportional to the product of the voltage and current drawn from supply that is the power drawn. - The voltage controlled oscillator gives a frequency proportional to its input (which is proportional to the power). - The ADC converts the square wave frequency analog output to display the energy in watthour.