USB resistor dc electronic load With switch adjustable 3 current 5V1A/2A/3A battery capacity voltage

A designed according to the principle of ohms law and through the resistor in parallel through a different switch can produce 3 kinds of resistance of a new USB electronic load resistance discharge when all the switch opens is 22 ohm10W 47 ohm10W 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 ohms law I UR

Resistor in parallel calculation formula R11R11R21Rn
K147Ohm10W K222Ohm10W

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