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What is the efficiency of a motor that converts 100J of electric energy into 70j of useful energy?
Wiki User
∙ 13y ago
70% efficient
Take: Useful work out
--------------------- X 100 = efficiency
Work in
Wiki User
∙ 13y ago
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What does energy efficiency?
Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The useful output may be electric power, mechanical work, or heat.
What kind of energy is created when an energy conversion is happening?
Energy conversion takes place when one form of energy is converted to another form. An example would a turbine, which converts heat energy to mechanical energy, or a generator which converts mechanical energy to electrical energy, or an electric motor which converts electrical energy to mechanical energy. In all conversion processes energy is lost (i.e. it is converted to heat at a low temperature). The useful power output of a machine is always less than the power input, by a ratio called the efficiency, usually expressed as a percentage. Typical efficiency for an electric motor is 95%, for a car engine 25%.
What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?
Such a machine would have an efficiency of 100% and, as the question suggests, it would be a miracle. No real machine is 100% efficient because there are always losses.
What is the percentage of energy used to do work called?
The term EFFICIENCY is defined as useful work, divided by total energy expenditure.
How is energy efficiency determined?
You divide useful output energy by the input energy. Or equivalently, useful output power by input power.
What does energy efficiency?
Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The useful output may be electric power, mechanical work, or heat.
What kind of energy is created when an energy conversion is happening?
Energy conversion takes place when one form of energy is converted to another form. An example would a turbine, which converts heat energy to mechanical energy, or a generator which converts mechanical energy to electrical energy, or an electric motor which converts electrical energy to mechanical energy. In all conversion processes energy is lost (i.e. it is converted to heat at a low temperature). The useful power output of a machine is always less than the power input, by a ratio called the efficiency, usually expressed as a percentage. Typical efficiency for an electric motor is 95%, for a car engine 25%.
What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?
Such a machine would have an efficiency of 100% and, as the question suggests, it would be a miracle. No real machine is 100% efficient because there are always losses.
The percentage of energy from a fuel that is actually used to perform work is its?
That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.
How can you calculate the efficiency of an appliance in terms of power?
vague question. Efficiency in terms of energy = useful energy/total energy x 100 vague question. Efficiency in terms of energy = useful energy/total energy x 100
What is the percentage of energy used to do work called?
The term EFFICIENCY is defined as useful work, divided by total energy expenditure.
What is an efficiency ratio?
The efficiency ratio for a machine usually refers to the ratio of the useful energy available from a machine and the energy put into it.
How is energy efficiency determined?
You divide useful output energy by the input energy. Or equivalently, useful output power by input power.
What is a comparison of the amount of energy before conversion with the amount of useful energy after conversion?
Energy Efficiency
What is the relationship between efficiency useful energy output and total energy output?
pie
Total energy input equals equals the useful energy output plus?
Efficiency = ( useful energy output / total energy input ) x 100
Does an electric iron convert electric energy to heat and motion?
heat(useful energy) and sound(waste energy)
