Infact, we usually get confused over HP and BHP.
1 HP means .746 kws which mean if an engine is rated 1 HP that mean it is equivalant to .746 kws.
whereas, BHP means BRAKE HORSE POWER, which is calculated like this :-
Say 10 bhp at 7000 rpm. means it would need another engine creating 10 horsepower rotating in opposite direction when out engine is rotating at 7000 rpms.
Then comes CC=cubic capacity of an engine like 110 cc et el.
Nowadays PS/ PSi etc are common terms ( rather German to calculate power ) and most he local manufactururs delibrately use these alien terms to make the actual figures obsecure. This way the consumer couldl never make out the difference.