centiot Battery DC Load Tester - USB Interface Micro Controller Board Electronic Hobby Kit

This product is designed according to the principle of ohm's law and through the resistor in parallel and two different switches, the module can provide 3 kinds of resistance for USB power input, when all the switch opens, is 2.2 ohm/10W, 4.7 ohm/10W, 2 kinds of resistance in parallel at the same time, in 5V voltage almost can produce 3A discharge current. The actual current size, please according to ohm's law: I = U/R Resistor in parallel calculation formula: R=1/(1/R1+1/R2+...+1/Rn) K1=4.7Ohm/10W , K2=2.2Ohm/10W