Horse power types

Type of horse power :-

1.Indicated horse power(I. H. P)  :-  It is the power that is produced inside the cylinder or motor of an engine, it is also called theoretical horsepower.

2. Brake horse power(B. H. P)  :- This is the power we actually get from the engine.   
3. Frictional horse power (F. H. P) :- The power lost due to friction is called friction horse power.

I. H. P = PLAN  (in metric system) 
                4500 
P = average pressure in kg/cm^2
L = length of stroke in metre
A =area of piston or cylinder in cm^2
N = r.p.m of crank shaft
 I. H. P = PLAN (in British system) 
                 3000
In four stroke engine take r.p.m  =N/2
In double acting engine take r.p.m = N×2
In multi cylinder engine= I.H.P×No.of cylinder
               
I. H. P = B. H. P +F. H. P
B. H. P =I. H. P - F. H. P
EFFICIENCY = B. H. P  ×100
                           I. H. P
Gravitational units - 
i) m.k.s system : kgm/sec
ii) c.g.s system : gm cm/sec 
iii) f.p.s system : foot pound /sec