Question

1hp is equal to:
A. 0.746kw
B. 7.46kw
C. 74.6kw
D. 746kw

Answer 1

Hint: hp stands for horsepower and this is the unit of active power. This word horsepower is generally used for electric machines and electric generators.

Complete step by step answer:
 In electrical physics, there are three power definitions that are real power or active power or true power, reactive power, and apparent power or total power.
And units of this power is
 “KW or watt” for real power,
 “VAR or KVAR” for reactive power
 “VA or KVA” for apparent power.
And the symbol of those power is
P for real power or active power
Q for reactive power and
S for the apparent power
If we show that all three powers in the triangle then the base will be active power, height will be reactive power and the diagonal will be apparent power or total power.
     

If we want to show these all three quantity in a formula then the formula will be
 S=P+iQ
By the formula, we can see that the apparent power is the conjugate of real power and reactive power.
Generally, we measure real power in KW (kilowatt) but for large power, we also measure the power in hp (horsepower).
1 hp is equal to 746 watts but all the options are all given in the form of KW so we have to convert watt into kilowatt dividing by 1000.
So in KW, 1hp is equal to 0.746KW
The answer is (A)
Note: Students will be confused between option(A) and option(D) because if we know the digit 746 but we will confuse it with unit KW and Watt. So we have to remember the data with units exactly.