Question

can i connect an Arduino UNO directly to a house hold circuit

Answer 1

Question:-

can i connect an Arduino UNO directly to a house hold circuit

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The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board.

Answer 2

The Arduino Uno pins are rated to a maximum output current of 40mA, but this does not mean that, if an external circuit attempts to draw more, the Arduino will refuse. ... If it is equal or less than what the Arduino is rated to give out, you should have no problems connecting the Arduino directly to the circuit.