If the resistance of a conductor depends on the number of collisions of free electrons, then how the resistance of a conductor is inversely proportional to the current flowing in it? As more current means more flow of free electrons?
Answers
A conductor has a large number of free electrons. When a potential difference is applied across the ends of a conductor, the free electrons move from one end to the other end of the conductor. When electrons drift or move, they collide with the atoms (ions) of the conductor. These collisions oppose the movement of free electrons from one end to the other end of the conductor. This opposition to the flow of free electrons due to the collisions with ions in a conductor is known as the Resistance of the conductor. The more the collisions suffered by electrons in a conductor, the more is resistance offered by the conductor.
Answer:
A battery is a device that converts chemical energy directly to electrical energy. It consists of a number of voltaic cells connected in series by a conductive electrolyte containing anions and cations. One half-cell includes electrolyte and the anode, or negative electrode; the other half-cell includes electrolyte and the cathode, or positive electrode. In the redox (reduction-oxidation) reaction that powers the battery, cations are reduced (electrons are added) at the cathode, while anions are oxidized (electrons are removed) at the anode. The electrodes do not touch each other but are electrically connected by the electrolyte. Some cells use two half-cells with different electrolytes. A separator between half-cells allows ions to flow, but prevents mixing of the electrolytes.