Table of Contents

- 1 What is the efficiency for an ideal machine?
- 2 Is there a machine that is 100% efficient?
- 3 Why is the efficiency of a machine always less than 100 %?
- 4 What is an ideal machine and what is its efficiency Why is this not achievable in practice?
- 5 Which machine has highest efficiency?
- 6 Can a machine have an efficiency that is greater than 100 explain?
- 7 What is the efficiency of a simple machine?
- 8 How do you calculate the efficiency of a machine?
- 9 Is the efficiency of an ideal machine 100%?
- 10 How is the efficiency of a machine determined?
- 11 Which is an example of a low efficiency machine?

## What is the efficiency for an ideal machine?

The efficiency of an ideal machine is 1 (or 100%).

## Is there a machine that is 100% efficient?

A simple machine, such as a lever, pulley, or gear train, is “ideal” if the power input is equal to the power output of the device, which means there are no losses. In this case, the mechanical efficiency is 100%.

**Why is efficiency less than 1?**

Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of a machine can never be greater than its input, so the efficiency can never be greater than 1.

### Why is the efficiency of a machine always less than 100 %?

The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction, the efficiency of any machine is always less than 100 percent.

### What is an ideal machine and what is its efficiency Why is this not achievable in practice?

Answer: In ideal machines , all the input energy should be converted to output energy . But , some part of energy is always lost in overcoming friction and input energy is always greater than output energy . Hence , no machine is ideal.

**What is efficiency with example?**

Efficiency is defined as the ability to produce something with a minimum amount of effort. An example of efficiency is a reduction in the number of workers needed to make a car. The ratio of the effective or useful output to the total input in any system.

#### Which machine has highest efficiency?

The most efficient electrical machine is the transformer. Transformers have efficiency above 95%.

#### Can a machine have an efficiency that is greater than 100 explain?

Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input. The energy a machine produces is always less than the energy put into it (energy input). That is why 100% efficiency in machines shall not be possible.

**What makes machine less efficient?**

The efficiency of machine is reduced due to friction.

## What is the efficiency of a simple machine?

Simple machines always have efficiencies of less than 1.0 due to internal friction. Energy conservation. Ignoring for a moment the losses of energy due to friction, the work done on a simple machine is the same as the work done by the machine to perform some sort of task.

## How do you calculate the efficiency of a machine?

To calculate the efficiency of a machine, divide the output work by the input work and multiply the result by 100 percent.

**Why is an ideal machine not achievable?**

### Is the efficiency of an ideal machine 100%?

Yes, an ideal machine would have an efficiency of 100%, but no machine is ideal. Because some work is wasted in all machines, there will always be less than 100% efficiency in all machines. What would a machine that had 100 percent mechanical efficiency be called?

### How is the efficiency of a machine determined?

The efficiency of a machine is equal to the ratio of its output (resistance multiplied by the distance it is moved) to its input (effort multiplied by the distance through which it is exerted); it is also equal to the ratio of the AMA to the IMA. This does not mean that low-efficiency machines are of limited use.

**What is the efficiency of a frictionless machine?**

Thus, the ratio of the resistance force to the effort, called the actual mechanical advantage (AMA), is less than the IMA. The efficiency of any machine measures the degree to which friction and other factors reduce the actual work output of the machine from its theoretical maximum. A frictionless machine would have an efficiency of 100%.

#### Which is an example of a low efficiency machine?

This does not mean that low-efficiency machines are of limited use. An automobile jack, for example, must overcome a great deal of friction and therefore has low efficiency, but it is extremely valuable because small effort can be applied to lift a great weight.