how to convert amps to watts

how to convert amps to watts

1.DC voltage

P = I × V

ohm's law

P = E × I

P = R × I²


P=  E² × R

Example:

12V     5A

P 12V  × 5A      = 60W

P = R  ×  I²

R = P /  I²  

R = 60W /   5²   = 2.4

P = 2.4  × 5²   = 60W

P= E² × R

P = 12²  / 2.4      = 60W

 2. Single phase voltage

P = PF × I × V

Example:

P = 0.8PF × 5A × 230V

P = 920W

3. Three phase voltage

P = √3 × PF × A × V

Example:

P = √3 ×0.8 PF ×5A ×415V

P = 2875.12W