Difference Between Mechanical Advantage And Efficiency
|It is the ratio of load and effort If a weight w is raised by a machine when effort P is applied Mechanical advantage =||It is the ratio between work done by the
machine (output) to the work done on the
I W machine (Input).
|lf the mechanical advantage is greater than one, the machine will make our work easier.||We can never et more work out of a machine than we put in Le. a machine cannot create any energy.|
The ratio between the load lifted and the effort applied is called the mechanical advantage of a machine.
If W is the weight lifted by the machine and P is the effort applied to the machine, then
The weight lifted by the machine
Mechanical Advantage =
M.A =……………………………. (3)
Since mechanical advantage is the ratio between two forces, so it has no unit. It is expressed n numbers.
The ratio between the useful work done by the machine (output) to the work done on the machine (input) is called efficiency.
Efficiency is usually expressed in percentage.
The efficiency of a reel machine is always less than l.A perfect machine has 100% efficiency or 1
For an ideal machine
Efficiency = 1
Or = 1
Or output = input