Question

how many types of lever are there?explain

Answer 1

There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum. Class 1 has the fulcrumplaced between the effort and load, Class 2 has the load in-between the effort and the fulcrum, and Class 3 has the effort between the load and the fulcrum.
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Answer 2

There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum. Since humans usually provide energy to levers, "effort" and "load" are often used instead of input and output.

Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum. Class 3 has the effort between the load and the fulcrum