Steelwolf
Flashlight Enthusiast
The other post about the handcrank flashlight reminded me that I had a question about the generator. I started a new thread so as not to hijack the other one.
Basically, the question is this:
Supercapacitors need to have their input voltage controlled so as not to detroy them. But they can accept very high currents, which allow them to be charged very quickly. Given a standard hand-cranked generator, how can it be modified to produced increased amounts of current?
Increase number of windings? Increase crank speed?
I sort of recall a physics class that demonstrated the voltage is related to the speed at which the windings move through the magnetic field, while the current is related to the strength of the magnetic field or the number of windings going through the field.
Am I right? I couldn't find my high school physics text to check it out.
I just wanted a generator that will charge up my supercaps quickly (minimum number of cranks). If I can get a generator to produce 5V 500mA, I could probably fully charge a supercap in 10seconds.
Basically, the question is this:
Supercapacitors need to have their input voltage controlled so as not to detroy them. But they can accept very high currents, which allow them to be charged very quickly. Given a standard hand-cranked generator, how can it be modified to produced increased amounts of current?
Increase number of windings? Increase crank speed?
I sort of recall a physics class that demonstrated the voltage is related to the speed at which the windings move through the magnetic field, while the current is related to the strength of the magnetic field or the number of windings going through the field.
Am I right? I couldn't find my high school physics text to check it out.
I just wanted a generator that will charge up my supercaps quickly (minimum number of cranks). If I can get a generator to produce 5V 500mA, I could probably fully charge a supercap in 10seconds.