Difference Between Mechanical Advantage And Efficiency
| MECHANICAL ADVANTAGE | EFFICIENCY |
|
Definition |
|
| 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). Efficiency = |
|
Machine Output |
|
| 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. |
MCIIAN1CAL ADVANTAGE
Definition
The ratio between the load lifted and the effort applied is called the mechanical advantage of a machine.
MATHEMATICAL EXPRESSION
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.
EFFICIENCY
The ratio between the useful work done by the machine (output) to the work done on the machine (input) is called efficiency.
Efficiency =
………………………… (4)
Efficiency is usually expressed in percentage.
Eff =
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
