Welcome to the world of Engineers
Units of Resistivity From Equation we have In the S.I. system of units, Hence, the unit of resistivity is ohm-metre (Ω-m). If l is in centi metres and A in …
Electric Currents & Ohm’s Law – Units of Resistivity Read MoreThe Unit of Resistance The practical unit of resistance is ohm.** A conductor is said to have a resistance of one ohm if it permits one ampere current to flow through it …
Electric Currents & Ohm’s Law – The Unit of Resistance Read MoreWhat is resistance? It may be defined as the property of a substance due to which it opposes (or restricts) the flow of electricity (i.e., electrons) through it. Resistance is a measure …
Electric Currents & Ohm’s Law – Resistance Read MoreThe Idea of Electric Potential A simple voltaic cell is shown. It consists of copper plate (known as anode) and a zinc rod (i.e. cathode) immersed in dilute sulphuric acid …
Electric Currents & Ohm’s Law – The Idea of Electric Potential Read MoreCharge Velocity and Velocity of Field Propagation Question : Find the velocity of charge leading to 1 A current which flows in a copper conductor of cross-section 1 cm2 and …
Electric Currents & Ohm’s Law – Charge Velocity and Velocity of Field Propagation Example Read MoreCharge Velocity and Velocity of Field Propagation The speed with which charge drifts in a conductor is called the velocity of charge. As seen from above, its value is quite low, …
Electric Currents & Ohm’s Law – Charge Velocity and Velocity of Field Propagation Read MoreQuestion : A conductor material has a free-electron density of 1024 electrons per metre3. When a voltage is applied, a constant drift velocity of 1.5 × 10−2 metre/second is attained …
Electric Currents & Ohm’s Law – Electron Drift Velocity Example Read MoreSuppose that in a conductor, the number of free electrons available per m3 of the conductor material is n and let their axial drift velocity be ν metres/second. In time dt, …
Electric Currents & Ohm’s Law – Electron Drift Velocity Read More