Horse power
Definition of Horse power
Horse´ pow`er
1.
The
power
which
a
horse
exerts
.
2.
(Mach.)
A
unit
of
power
,
used
in
stating
the
power
required
to
drive
machinery
,
and
in
estimating
the
capabilities
of
animals
or
steam
engines
and
other
prime
movers
for
doing
work
.
It
is
the
power
required
for
the
performance
of
work
at
the
rate
of
33
,
000
English
units
of
work
per
minute
;
hence
,
it
is
the
power
that
must
be
exerted
in
lifting
33
,
000
pounds
at
the
rate
of
one
foot
per
minute
,
or
550
pounds
at
the
rate
of
one
foot
per
second
,
or
55
pounds
at
the
rate
of
ten
feet
per
second
,
etc
.
Brake horse power
the
net
effective
power
of
a
prime
mover
,
as
a
steam
engine
,
water
wheel
,
etc
.,
in
horse
powers
,
as
shown
by
a
friction
brake
.
See
Friction
brake
,
under
Friction
.
Indicated horse power
the
power
exerted
in
the
cylinder
of
an
engine
,
stated
in
horse
powers
,
estimated
from
the
diameter
and
speed
of
the
piston
,
and
the
mean
effective
pressure
upon
it
as
shown
by
an
indicator
.
See
Indicator
.
Nominal horse power
(Steam Engine)
a
term
still
sometimes
used
in
England
to
express
certain
proportions
of
cylinder
,
but
having
no
value
as
a
standard
of
measurement
.
3.
A
machine
worked
by
a
horse
,
for
driving
other
machinery
;
a
horse
motor
.
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