What is S.I unit of electric power?  

The correct answer is Watt.

Explanation:

• The SI unit of electric power is the watt (W) or joule per second. 
• Electric power is the rate at which electrical energy is transferred, used, or dissipated in an electrical circuit. 
• It measures how quickly electrical energy is converted from one form to another or how much work is done per unit time.
• It is a scalar quantity, i.e., it has magnitude only but no particular direction.
• The formula for electric power is:
• P = V × I
• Where P is electric power, V is voltage across the circuit and I is the current flowing across the circuit.

Thus, the S.I unit of electric power is Watt.

Additional Information

Ampere 

• Ampere is the SI unit of Electic current.

Joule 

• Joule is SI unit of heat, energy and work.