How to build by myself a resistance of high power and small resistivity ?
I need to measure accurately a continuous current ( roughly over 20 Amps and probably more later ) but my amperemeter is limited to 2A. So I will pass this current thru a very small resistance, and measure the votlage across.
Using the graphite of a lead pencil ? I actually measured 1 ohm on a distance of several millimeters : using some of them in parallel, one can get as low as 0,1 Ohm.
Using a thin aluminium sheet ? Since: R = rho * L / S I can cut it in order to change L and then get R as small as I want.
Any suggestion that may help ?