What does a headgear of a mine do ?

Pl i need the answer now ! which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard

What is the power dissipated by a resistor with a current of 0.02 a and a resistance of 1,000 ? a. 200 w b. 20 w c. 0.4 w d. 4 w

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