Most Important Points | DC Circuits
- An independent source which can deliver or absorb energy continuously is called an Active Element.
- The resistivity of Annealed Copper at 20 degree centigrade is 1.725 x 10^-8 ohm-m.
- Of all Pure Metals, the Resistance increase with an increase in temperature.
- Resistance of Carbon, Electrolyte and Insulating Materials decrease with an increase in temperature.
- Of Alloys, the resistance increase very slightly with increase in temperature. Alloy used in electrical work, such as manganin shows no change of resistance for considerable variation of temperature. An alloy is a metal that is made by mixing two or more type of metals together.
- Bronze = Copper + Tin
- Ohm’s Law – The current flowing through a conductor is directly proportional to the potential difference existing between the two ends of the conductor. (Temperature Constant)
- Maximum Power Transfer Theorem – Power transfer to the load is maximum when load resistance R is equal to the Thevenin’s resistance Rth of the network.
Author and Reference:
Author: Mr. Paramjeet Singh Jamwal, Former Lecturer, Guru Nanak Education Trust Group of Institutions (GNET), Roorkee.
Reference: V N Mittle and Arvind Mittal, “Basic Electrical Engineering”.