Question

An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate of 2 m/s. The power of electric motor is :-

• A. $15kW$
• B. $9kW$
• C. $225kW$
• D. $9000HP$

Answer 1

The correct option is B $9kW$

Power is defined as $P=Fv$

where F is force and v is velocity.

$P=Fv=4500\times 2=9000W=9kW$