best electric bike value image
goodnevil
few scratches, few dents, electric start, everythings works, just needs some time and care. burns a little oil. cant keep, need to sell. not sur what its worth
Answer
I buy and sell a lot. When I sell, for a "decent bike" 15 yrs or older, with no major problems, I charge a dollar a cc. Seems fair to me, I sell a lot of bikes.
I buy and sell a lot. When I sell, for a "decent bike" 15 yrs or older, with no major problems, I charge a dollar a cc. Seems fair to me, I sell a lot of bikes.
Where does the energy to generate the electricity of a Dynamo come from?
Zee
I am curious about this topic.
Also,
What will affect how much electric current the Dynamo generates?
Thankyou
Answer
Hello Zee, it is so curious to explain such things to those who is realy thirsty to know about. Good. Energy is the ultimate. Energy can neither be created nor be destroyed. But it could be changed from one form into another. Now in case of dynamo, the electro magnetic induction is used. The basic priciple is that when we rotate a coil in a magnetic field such that the magnetic flux gets cut or change then an induced emf is produced. So we have to rotate the coil by any means. We could rotate just by pedalling. That is the case of a dynamo working in case of a bike. Or else we can use fuel to run the engine ie petrol or diesel. Or we can use the water stored in a reservoir to fall and the kinetic energy of the falling water would be used to run the turbine, I mean the wheel. Or we can convert water into high pressurized steam with which we can do the rotation. To produce steam we need heat energy. That heat energy could be obtained from coal or by using atomic fission reaction in Uranium material. So basic idea is we have to rotate the coil. If you just rotate the fly wheel in case of a generator, you would experience an opposing force not allowing you to rotate. This is due to the induced emf. So if you provide enough energy to overcome such opposition, then you perform work and that energy would be the source to produce electrical energy. Any way as you supply 100 you will be getting only 40 or 50. This is due to many losses. That could be minimised as far as possible using our intelligence. So efficiency could be reaised any way upto 60 or 70 percent.
Now regarding the electriciy produced you have to understand the following details.
Energy per unit time is known as power. So electrical power is denoted by P
This P = V I. Here V is the voltage and I is current produced. So for a given P, if V is less then I will be more. But this is not good in case of sending current to far distance. Because of lengthy wire the resistance R would become larger. And due to this power loss usually named as I^2 R loss would become more. So it will be advisable to reduce the current I as far as possible. So V would be raised to very high value such as 100 thousand volt. For this we use step up transformer. Then at the consumer end once again the volt will be stepped down using transformers. That is why we see transformers erected at the borders of city and also at some locations within city. Better learn more in detail about current and voltage.
Hello Zee, it is so curious to explain such things to those who is realy thirsty to know about. Good. Energy is the ultimate. Energy can neither be created nor be destroyed. But it could be changed from one form into another. Now in case of dynamo, the electro magnetic induction is used. The basic priciple is that when we rotate a coil in a magnetic field such that the magnetic flux gets cut or change then an induced emf is produced. So we have to rotate the coil by any means. We could rotate just by pedalling. That is the case of a dynamo working in case of a bike. Or else we can use fuel to run the engine ie petrol or diesel. Or we can use the water stored in a reservoir to fall and the kinetic energy of the falling water would be used to run the turbine, I mean the wheel. Or we can convert water into high pressurized steam with which we can do the rotation. To produce steam we need heat energy. That heat energy could be obtained from coal or by using atomic fission reaction in Uranium material. So basic idea is we have to rotate the coil. If you just rotate the fly wheel in case of a generator, you would experience an opposing force not allowing you to rotate. This is due to the induced emf. So if you provide enough energy to overcome such opposition, then you perform work and that energy would be the source to produce electrical energy. Any way as you supply 100 you will be getting only 40 or 50. This is due to many losses. That could be minimised as far as possible using our intelligence. So efficiency could be reaised any way upto 60 or 70 percent.
Now regarding the electriciy produced you have to understand the following details.
Energy per unit time is known as power. So electrical power is denoted by P
This P = V I. Here V is the voltage and I is current produced. So for a given P, if V is less then I will be more. But this is not good in case of sending current to far distance. Because of lengthy wire the resistance R would become larger. And due to this power loss usually named as I^2 R loss would become more. So it will be advisable to reduce the current I as far as possible. So V would be raised to very high value such as 100 thousand volt. For this we use step up transformer. Then at the consumer end once again the volt will be stepped down using transformers. That is why we see transformers erected at the borders of city and also at some locations within city. Better learn more in detail about current and voltage.
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Thanks For Coming T0 My Blog
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