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If 250 watts of power is input into a mechanical system can you get 250 watts of power out?
Wiki User
∙ 12y ago
Yeah all you need is a completely friction less system.
Wiki User
∙ 12y ago
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How many amperes use an electric heater?
The electric heater will have power rated in Watts. The Amps it will draw depends on the voltage system you are using. Can be calculated by formula I (Amps) = P / V In the USA with 110V system a 2400W heater will draw 2400 Watts / 110 Volts = 21.8 Amps In Australia with a 230 V system a 2400W heater will draw 2400 Watts / 230 Volts = 10.4 Amps
Does a 100 watt dc motor put out 100 watts in reverse?
Yes it can but it is a bit more complicated then that. The motor that is rated at 100 Watts will draw 100 watts electrical power, but will only output 70-80% of that in mechanical power. So in order to get 100 watts back out you would have to put in ~120 watts of mechanical power to get 100 watts electrical back out.
How many amps does a 4 ton unit draw?
You need the EER rating, that will let you calculate the power used. EER is a measure of efficiency, power input versus power output. The Energy Efficiency Ratio (EER) of a particular cooling device is the ratio of output cooling (in Btu/hr) to input electrical power (in Watts) at a given operating point (indoor and outdoor temperature and humidity conditions). one ton HVAC capacity = 12,000 BTU/hour = 3500 watts so if the EER is 10, then input power is 12000/10 = 1200 watts Current used, if this is a 240 volt system, is 1200/240 = 5 amps Another similar rating is COP (Coefficient of power) which is the output power in watts (instead of BTU/h) divided by input power, so with a COD = 3, for example, input power is 3500 /3 = 1200 watts.
How are watts measured?
Electrical power is measured in watts. In an electrical system power (P) is equal to the voltage multiplied by the current.P = VxI Watts = Volts x Amps.
Input 100-240 V 50-60Hz 1.5A 1 5A what is power in watts?
100v at 1A is 100 watts, 240 v 5A is 1200 watts. The other numbers give intermediate amounts of watts.
If a 13 dB gain antenna has 2 watts of power at the input what is the effective radiated power?
40 watts
How many amperes use an electric heater?
The electric heater will have power rated in Watts. The Amps it will draw depends on the voltage system you are using. Can be calculated by formula I (Amps) = P / V In the USA with 110V system a 2400W heater will draw 2400 Watts / 110 Volts = 21.8 Amps In Australia with a 230 V system a 2400W heater will draw 2400 Watts / 230 Volts = 10.4 Amps
What is percentage of efficiency if a power supply produces a 0.5 Watts output with an input of 0.6 Watts?
You need to divide the output power by the input power. If you want to express that as a percentage, you would also multiply this result by 100.
What is the power output of the human heart?
The mechanical power of the human heart is ~1.3 watts. It takes a much higher rate of energy turnover (~13 watts) to provide this mechanical power, since the mechanical efficiency of the heart is very low (less than 10%).
Does a 100 watt dc motor put out 100 watts in reverse?
Yes it can but it is a bit more complicated then that. The motor that is rated at 100 Watts will draw 100 watts electrical power, but will only output 70-80% of that in mechanical power. So in order to get 100 watts back out you would have to put in ~120 watts of mechanical power to get 100 watts electrical back out.
Prove 1 horsepower equals 746 watts?
There is no proof. 1 mechanical horse power is simply defined as 745.7 watts. Period.
How do you calculate power dissipated by an IC?
It is very critical to never exceed the input voltage of an IC to begin with. To calculate the power dissipation ( in watts) VxI (Voltage x Current) will give you power in watts.
Electrical power is expressed in watts or?
Electrical power is expressed in watts or in jouls per secondAnother AnswerThere is no such thing as 'electrical power'. Power is simply a rate: the rate of doing work. Power can be measured in watts (in the SI system) or in horsepower (in the Imperial system). There is no reason why the power of a heater can't be measured in horsepower or the power of a car can't be measured in watts.
How many amps does a 4 ton unit draw?
You need the EER rating, that will let you calculate the power used. EER is a measure of efficiency, power input versus power output. The Energy Efficiency Ratio (EER) of a particular cooling device is the ratio of output cooling (in Btu/hr) to input electrical power (in Watts) at a given operating point (indoor and outdoor temperature and humidity conditions). one ton HVAC capacity = 12,000 BTU/hour = 3500 watts so if the EER is 10, then input power is 12000/10 = 1200 watts Current used, if this is a 240 volt system, is 1200/240 = 5 amps Another similar rating is COP (Coefficient of power) which is the output power in watts (instead of BTU/h) divided by input power, so with a COD = 3, for example, input power is 3500 /3 = 1200 watts.
A generator produces 240volts at 25 amperes. If the mechanical and electrical power losses total 900 watts what is the efficiency of the generator?
Efficiency is measured as the ratio of power output to power input. In this case the power input of the generator is 240V * 25A = 6000 VA however the stated losses are 900 W so the power output is 6000 - 900 = 5100W. Then the efficiency would be 5100/6000 = 0.85 or 85% efficient.
What does conversion of electrical power to mechanical power mean?
There is no such thing as 'electrical power' or 'mechanical power' or, in fact, any other sort of power. Power is simply a rate -the rate of doing work. In SI, power is measured in watts. An obsolete unit of power is a horsepower. Although, in the Unites States, the power of an engine is usually measured in horsepower, elsewhere it is measured in watts (or, more usually, kilowatts).So, when an engineer describes converting electrical power to mechanical power, what he actually means is the rate of converting electrical energy to mechanical energy.
What wattage of voltage converter should be used to power a product that is 3400 watts and uses a power input of 110 volts?
Anything over 3400 watts is ok for a converter to power the product. The converter's rating is a maximum value so it can power anything up to 3400 watts.
