29-09-2018, 07:02 PM
Reckless
You have it a bit back to front.
Voltage is a measurement of electric pressure, amps is a measurement of electric current flow (flow of electrons from the atoms/molecules of the material that the current is flowing in) and ohms is the resistance of that material to current flow (Material with lots of easily moved electrons will have a lower "resistance" whereas an insulator has very few free-to-move electrons).
Use the water analogy.......The battery is the water pump with Volts the unit of pressure, electrons are the flowing water and diameter of pipe/hole in bung in pipe is a resistance to the flow.
Thus for a given pipe/hole/wire size more or less water/current flows depending on pump pressure/voltage - higher voltage = higher pressure so higher current.
There needs to be a little bit of caution over fuse ratings......some ratings are the current (amps) at which the fuse will blow but others are a higher amperage to allow for spikes of higher voltage which would cause a momentary higher current but the fuse stays intact and the current continues back at its NORMAL LOWER rated value after the spike.
e.g. a 25A fuse may be one which melts at 25 amps OR it may be one which normally runs in a circuit which runs at a lower current but it will take 25 amps for a short period. (Yes a subtle difference but important)
There a bit of nuclear physics for the Austin 7
Denis
You have it a bit back to front.
Voltage is a measurement of electric pressure, amps is a measurement of electric current flow (flow of electrons from the atoms/molecules of the material that the current is flowing in) and ohms is the resistance of that material to current flow (Material with lots of easily moved electrons will have a lower "resistance" whereas an insulator has very few free-to-move electrons).
Use the water analogy.......The battery is the water pump with Volts the unit of pressure, electrons are the flowing water and diameter of pipe/hole in bung in pipe is a resistance to the flow.
Thus for a given pipe/hole/wire size more or less water/current flows depending on pump pressure/voltage - higher voltage = higher pressure so higher current.
There needs to be a little bit of caution over fuse ratings......some ratings are the current (amps) at which the fuse will blow but others are a higher amperage to allow for spikes of higher voltage which would cause a momentary higher current but the fuse stays intact and the current continues back at its NORMAL LOWER rated value after the spike.
e.g. a 25A fuse may be one which melts at 25 amps OR it may be one which normally runs in a circuit which runs at a lower current but it will take 25 amps for a short period. (Yes a subtle difference but important)
There a bit of nuclear physics for the Austin 7
Denis