Lexicon: R
Resistance
Electrical - or ohmic - resistance. It is caused by the collision of moving charge carriers with atoms of the conductor. This inhibits the uniform movement of charge carriers - the flow of current. The resistance of a conductor decreases as the cross-section of the conductor material increases, as the electrons have more space in the conductor for the same current (= same number of charge carriers) and so there are fewer collisions with the metal lattice. The resistance also increases with a longer conductor length, as the probability of a collision over a longer distance increases. The resistance of metallic conductors increases with increasing temperature (PTC thermistors). Semiconductors are so-called hot conductors, which have a lower resistance with increasing temperature
.resistance = voltage/current; "inhibition" for the current flow, expressed in ohms. The smaller the cross-section, the greater the resistance. The more ohms, the worse the current flow. (All data without guarantee)