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You could write it like this:

<center>[+]P_{in} = I_{in} \times V_{in}[+]</center>
- [+]I_{in}[+] = electric current of the input in ampere (A)
- [+]V_{in}[+] = voltage of the input in volt (V)

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Note: If you see this comment in Busy, you will most likely not see the [+] symbols but code for images. Yeah, Busy replaced that.