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Transformer Power Rating


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ok then i am preparing to add something else , temprature meter , fan , and a Power meter that shows the actual wattage, for power measurment i will be using  a ADC to measure voltage and current and then when it is binary form , digitaly multiply them using logic gates , and then convert the binary power output to 7 segment using a BCD to 7 segment decoder . how is the idea ..

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Why make a complicated power meter? The power changes in less than a milli-second so a 7-segment display will be a blur.
You hear loudness, not power. Just make an LM3915 LED bar-graph sound level meter or voltmeter. Have a peak-detect circuit to hold readings for about 50milli-seconds so they are visible.

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