How to calculate kw in ac and dc

How to calculate kw in ac and dc

1. DC Voltage
Formula .
P = I  × V / 1000

Example:

I = 5
V= 12
P =?

P =5I ×12V / 1000

P = 0.06KW


2. Single phase voltage

P = PF  × A  × V / 1000


Example:
P.F = 0.8
A   = 5
V   = 230
KW (P) = ?

P =0.8PF ×5 A × 230V / 1000
P= 0.92KW

3. Three phase voltage

P = PF × √3  × A  × V / 1000

Example:

P.F = 0.8
A   = 5
V   = 415
P    = ?
P = 0.8PF × √3 × 5A × 415V / 1000
P   = 2.875 KW