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electronvolts and kilowatt hours!
Can anyone help me with this question!Its worth 9marks, Im just really not very good with the wordy physics questions, and my textbook doesnt really help on this one!
The concept of energy is important in many branches of physics. Energy is usually measured in joules, but sometimes the kilowatt-hour and the electronvolt are more convenient units for energy.
Define the kilowatt-hour and the electronvolt and determine their values in joules.
Suggest why the kWh and eV may be more convenient than joules.
Illustrate you answer by determining
The energy dissipated by a 100W filament lamp left on for 12hours
The kinetic energy of an electron accelerated through a p.d. of 1.0 MV in a particle accelerator
Thank you!
The concept of energy is important in many branches of physics. Energy is usually measured in joules, but sometimes the kilowatt-hour and the electronvolt are more convenient units for energy.
Define the kilowatt-hour and the electronvolt and determine their values in joules.
Suggest why the kWh and eV may be more convenient than joules.
Illustrate you answer by determining
The energy dissipated by a 100W filament lamp left on for 12hours
The kinetic energy of an electron accelerated through a p.d. of 1.0 MV in a particle accelerator
Thank you!
Reply 1
I'm not going to do this problem for you, because you'll learn a lot more if you think about it yourself. But I will say:
1) Kilowatt-hour. It means what it says on the tin. If you have a power supply that provides 1 kW, and it runs for one hour, how much energy do you have? For when this is useful, think about times when you might want to know how long you can provide a certain power supply for...
2) It takes energy to move a charge from a low potential region to a higher one. You should know that this is the charge multiplied by the voltage (or potential difference).
An electron has a charge on it - so 1 electron volt is the energy needed to move an electron through a potential difference of 1 volt.
When is this useful? Well, when might you need to consider energy in terms of the charge on an electron and a potential difference? The question even gives you an example here...
1) Kilowatt-hour. It means what it says on the tin. If you have a power supply that provides 1 kW, and it runs for one hour, how much energy do you have? For when this is useful, think about times when you might want to know how long you can provide a certain power supply for...
2) It takes energy to move a charge from a low potential region to a higher one. You should know that this is the charge multiplied by the voltage (or potential difference).
An electron has a charge on it - so 1 electron volt is the energy needed to move an electron through a potential difference of 1 volt.
When is this useful? Well, when might you need to consider energy in terms of the charge on an electron and a potential difference? The question even gives you an example here...
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