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What is the unit of resistance?

The correct expression of Ohm's law is:

The current flowing through the resistor (R = 6 Ω) is (0.6A). Then what is the resistors?

Choose the correct transformation from the following:

From the graph showing the dependence of the amperage on the voltage for two resistors R1; R2 in the following figure:

Connect a conductor with resistance (R = 12 ) to the voltage (3V ), what is the current through it?

What is the value of this resistor?