Q: What is efficiency always less than?

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You don't. Such an efficiency can be less than 1, but it can't be greater than 1.

It SHOULD always be less than the divisor... Otherwise your answer is wrong.

Negative numbers are always less than their absolute value.

A negative number is always less than a positive number, in the exact same way that 3 is less than 4 and always will be.

... less than the original fraction.

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It is the output energy compared to the input energy. This will always be less than 100%

The efficiency is always less than one because some of the energy is always useless for what you want. Most wasted energy eventually turns into heat. therefore the efficiency is like a percentage with 1 being 100% a device can't be 100% efficient as some energy is wasted. To work out the efficiency of a device you need to do the total useful energy produced divided by the total energy that is inputted into the device

The efficiency of an actual machine is always less than 100 percent, as no machine can convert all input energy into useful output energy due to factors like friction, heat loss, and inefficiencies in the system.

why is the efficiency of a calorimeter less than 100%

some energy is always lost to factors like friction, heat, and sound during the operation of a machine, reducing its efficiency below 100%.

For a machine with efficiency less than 100%, the output work will always be less than the input work. This is because some of the input work is lost as waste energy due to factors like friction, heat, or other inefficiencies in the machine. The efficiency of a machine is a measure of how well it converts input work into useful output work.

input

Because there is always going to be friction, the efficiency of any machine will always be less then 100 percent.

That simply means that some energy is lost, due to friction and other causes.

The efficiency of a machine is always less than 100% due to energy losses that occur during its operation. These losses can result from factors such as friction, heat generation, and air resistance. No machine can convert all input energy into useful work without some energy being lost as waste.

If loads varies then efficiency is less steeply than efficiency. This is taught in science.

No. A perfectly frictionless machine could have an efficiency of 100%. Anything less perfect must have can efficiency less than 100%.