# Electrical Circuits/ Network Theory

The most important topics in network theory/ electrical circuits are DC and AC steady states, this is where 80% of the problems come from and is the best area to score. Here are the few questions of the examination’s taste, hope you like them.

### Circuit theory uses:

This is an important subject for electrical engineers for reduction of bigger circuits and analyse. It is the base necessity for any machine/circuit/gadget to design.

Network theory is the study of graphs as a representation of either symmetric relations or asymmetric relations between discrete objects. In computer science and network science, network theory is a part of graph theory: a network can be defined as a graph in which nodes and/or edges have attributes (e.g. names).

Network theory has applications in many disciplines including statistical physicsparticle physics, computer scienceelectrical engineeringbiologyeconomicsfinanceoperations researchclimatologyecology and sociology. Applications of network theory include logistical networks, the World Wide Web, Internetgene regulatory networks, metabolic networkssocial networksepistemological networks, etc. see List of network theory topics for more examples.

Euler’s solution of the Seven Bridges of Königsberg problem is considered to be the first true proof in the theory of networks.

Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flowshortest path problemtransport problemtransshipment problemlocation problemmatching problemassignment problempacking problemrouting problemcritical path analysis and PERT (Program Evaluation & Review Technique). In order to break a NP-hard task of network optimization down into subtasks the network is decomposed into relatively independent subnets.”WIKIPEDIA (SOURCES)

## Click 'NEXT' for Electrical Circuits Quiz

• Questions related to GATE/RRB-JE/PSUs and other engineering exams.
• 10 Minutes time limit.
• Basic circuit questions.
• Primary level.
1. Three parallel resistive branches are connected across a DC supply. What will be the ratio of the branch currents I1:I2:I3, if the branch resistances are in the ratio R1:R2:R3 :: 2:4:6
2. If the length of a wire of resistance R is uniformly stretched to n times it's original value, it's new resistance is:
3. What happens to the resistance of a conductor if it's length is increased three times and diameter is halved?
4. A drawn wire of resistance 5Ω is further drawn so that it's diameter becomes one-fifth of the original. What is the resistance with volume remaining the same?
5. The condition for the validity of Ohm's law is that the
6. A 12V automobile light is rated at 30W. The total charge that flows through the filament is one minute is:
7. The hot resistance of the filament of a bulb is higher than the cold resistance because the temperature co-efficient of the filament is:
8. For a fixed supply voltage the current flowing through a conductor will increase when it's

9. An electric current is the:
10. The flow of electric current in a conductor is due to the flow of: