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The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. The efficiency can be calculated as a decimal or a percentage, using the equations:
Dec 28, 2020 · Efficiency is a way of describing the amount of useful output a process or machine can generate as a percentage of the input required to make it go. In other words, it compares how much energy is used to do work versus how much is lost or wasted to the environment. The more efficient the machine, the less energy wasted.
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Jan 1, 2015 · Calculate the power of the motor. Answer: Step 1: Write down the efficiency equation. Step 2: Rearrange to make power input the subject. OR. Step 3: Calculate the power output. Δ E is equal to the change in gravitational potential energy as the load is lifted. Therefore, Step 4: Substitute the values into the power input equation.
Key fact. The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. The efficiency can be calculated as a decimal or a percentage. \ ( efficiency ...
It lifts a 7.2 kg load through a height of 5 m in 3 s. Calculate the power of the motor. Step 1: Write down the efficiency equation. Step 2: Rearrange for the power input. Step 3: Calculate the power out. The power output is the energy ÷ time. The electric motor transferred electric energy into gravitational potential energy to lift the load.
When a force close force A push or a pull. The unit of force is the newton (N). causes a body to move, work is being done on the object by the force. Work is the measure of energy transfer when a ...
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Calculate the power of the motor. Step 1: List the known quantities. Efficiency = 35%. Mass, m = 7.2 kg. Height, h = 5 m. Time, t = 3 s. Gravitational field strength, g = 10 N/kg. Step 2: Write down the efficiency equation. Step 3: Rearrange to make power input the subject.
