Question

1 horse power is equal to ______ watt :

• A. 746
• B. 500
• C. 646
• D. 700

Answer 1

Answer: (A)

746

One horse power (HP) $=550$ foot pound per second

Also,

• $1$ foot $=0.3048m$
• $1$ pound $=4.448N$

So, $1HP=550\times 0.3048\times 4.448Nm{s}^{-1}\simeq 746Nm{s}^{-1}$

Since $1W=1Nm{s}^{-1}$,

$\Rightarrow 746Nm{s}^{-1}=746watt$

Option A is correct.