This is definition of resistor from Wikipedia. 1. " A resistor is a two-terminal electronic component that opposes an electric current by producing a voltage drop between its terminals in proportion to the current" And this is another mention about Ohm's Law from a diagram of Wikipedia. 2. "A voltage source, V, drives an electric current, I , through resistor, R, the three quantities obeying Ohm's law: V = IR." After reading these two statements, I got confused. From 1, I can assume that a resistor produces a voltage V to oppose an electric current. But, when I read 2, Voltage send current through resistor not produced by resistor. Could you please explain me about that. I just started learning Electricity. Thanks.