Electrical Theorems - Electrical Dost

Electrical Dost

Explanation of Thevenin’s theorem

Statement: An active complex network can be replaced by a simple two-terminal network consisting of a constant voltage source VTH in series with a resistance RTH where VTH is the open-circuit voltage between terminals of the load with load removed and RTH is the resistance of the network measured between terminals of load with load … Read more

Explanation of Superposition Theorem

Superposition theorem: 1) Statement: In a multisource network consisting of linear, bilateral elements the current through any given element is equal to the algebraic sum of currents produced independently in that element by each source acting alone, when all other remaining sources are replaced by their internal resistances. 2) Explanation: Consider a network shown in … Read more

Explanation of Kirchhoff’s laws

Kirchhoff’s Laws: Kirchhoff’s Laws is divided into two types i) Kirchhoff’s Current Law (KCL) ii) Kirchhoff’s Voltage Law (KVL) Kirchhoff’s Current Law (KCL): Statement: The total current entering a junction is equal to the total current leaving the junction Explanation: Sign Convention: Incoming currents are taken as positive and outgoing currents as negative. Mathematically +I1- … Read more

Explain the effect of rise in temperature on resistance of i) metal conductors ii) insulators iii) Alloys iv) semiconductors

i) Metal conductors: In the case of conductors when the temperature is increased, resistance also increases i.e. R α T. e.g. copper, aluminum, gold, silver, etc. ii) Insulators: In the case of insulators, when the temperature is increased, resistance decreases. i.e. R α 1/T. e.g. PVC, wood, rubber, mica, etc. iii) Alloys: The resistance of … Read more