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1. voltage (difference in potential)

2. circuit (path)

3. a load (work to be done)

#3 in the above answer is incorrect.

Here is a simpler/more accurate answer to the question:

  1. Power supply (the device need electricity in order to run)
  2. Software (set of instructions to tell the hardware what to do)
  3. A method for the CPU to communicate with the device (i.e. a system, or data bus (aka the path)).

Even more simpler is...

1. Power

2. Load

3. Ground return

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Q: 1What three things do electronic hardware devices need in order to function?
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