Simple DC Networks topics include: Series circuits, parallel networks, power, energy, resistivity, temperature coefficient, kirchhoffs current and voltage laws. A simple DC network is a direct-current (DC) circuit that consists of a current source and one or more loads. The current source can be a battery, and the loads can be circuit elements like light bulbs and electric motors. DC circuits are mostly used for simple applications. In a DC circuit, the current flows in only one direction, from the positive terminal to the negative terminal.  There are two types of DC networks: active and... Show more

Simple DC Networks topics include: Series circuits, parallel networks, power, energy, resistivity, temperature coefficient, kirchhoffs current and voltage laws.

A simple DC network is a direct-current (DC) circuit that consists of a current source and one or more loads. The current source can be a battery, and the loads can be circuit elements like light bulbs and electric motors.
DC circuits are mostly used for simple applications. In a DC circuit, the current flows in only one direction, from the positive terminal to the negative terminal. 
There are two types of DC networks: active and passive. An active network contains one or more sources of supply, while a passive network does not contain any source of supply voltage or current. 

Some sources of DC current include:
Primary cell (zinc-carbon dry cell)
Rechargeable secondary cell (lead-acid cell)
Hydrogen fuel cell
Nickel-cadmium cell 

Kirchhoff's current and voltage laws quantify how current flows through a circuit and how voltage varies around a loop in a circuit. 

Kirchhoff's current law states that the current entering a junction must equal the current leaving a junction. This is a consequence of charge conservation. 
Kirchhoff's voltage law states that the change in potential around a closed loop must be zero. 

The formula for voltage rule is V = IR, where:
V: is the voltage difference
I: is current in the loop
R: is the resistance of the circuit element in ohms 

Gustav Robert Kirchhoff (1824-1887) formulated the Laws of Closed Electric Circuits in 1845. These laws are now known as Kirchhoff's Voltage and Current Laws. 

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Electrical Engineering Practice Test: Simple DC Networks

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25 Questions

1. Which of the following is not an expression power?

P=I2RP=V2/RP=VIP=I/R

2. KCL is associated with_________

Both mesh and nodalMesh analysisNodal analysisNeither mesh nor nodal

3. Nodal analysis is generally used to determine______

ResistancePowerCurrentVoltage

4. Calculate the value of I3, if I1= 2A and I2=3A.

5A-1A-5A1A

5. Calculate VAB.

3.5V9.5V12V6.5V

6. KCL is applied at _________

NodeNeither loop nor nodeBoth loop and nodeLoop

7. Calculate the power across each 20 ohm resistance.

500kW, 500kW1000W, 1000W500W, 500W1000kW, 1000kW

8. The currents in the three branches of a parallel circuit are 3A, 4A and 5A. What is the current leaving it?

The largest one among the three valuesInsufficient data provided12A0A

9. The resistance of pure metals ___________

Increases with an increase in temperatureBecomes zero with an increase in temperatureRemains the same with an increase in temperatureDecreases with an increase in temperature

10. Calculate the current across the 20 ohm resistor.

1A0.33A0.67A20A

11. What happens to the current in the series circuit if the resistance is doubled?

It becomes zeroIt becomes infinityIt becomes double its original valueIt becomes half its original value

12. Calculate the power across each 10 ohm resistance.

100W, 100W1kW, 1kW100kW, 100kW1000kW, 1000kW

13. Which of the following statements are true with regard to resistance?

Resistance is inversely proportional to the length of the wireResistance is directly proportional to an area of cross section of the wireResistance is inversely proportional to the resistivity of the wireResistance is directly proportional to a length of the wire

14. KVL is applied in ____________

Both mesh and nodalNeither mesh nor nodalNodal analysisMesh analysis

15. In a parallel circuit, with a number of resistors, the voltage across each resistor is ________

Is zero for all resistorsThe same for all resistorsIs divided proportionally across all resistorsIs divided equally among all resistors

16. A voltage across a series resistor circuit is proportional to?

The value of the other resistances in the circuitThe amount of time the circuit was on forThe power in the circuitThe value of the resistance itself

17. KVL deals with the conservation of?

MassMomentumChargeEnergy

18. The resistance of insulators __________

Decreases with an increase in temperatureIncreases with an increase in temperatureRemains the same with an increase in temperatureBecomes zero with an increase in temperature

19. KVL is associated with____________

Mesh analysisNodal analysisBoth mesh and nodalNeither mesh nor nodal

20. Calculate the total current in the circuit.

20 A10 A11.43 A15 A

21. A battery converts___________

Chemical energy to mechanical energyElectrical energy to chemical energyChemical energy to electrical energyMechanical energy to electrical energy

22. The current in each branch of a parallel circuit is proportional to _________

Proportional to the value of the resistorsProportional to the power in the circuitEqual in all branchesThe amount of time the circuit is on for

23. Calculate the equivalent resistance between A and B.

8 ohm4 ohm6 ohm2 ohm

24. The reciprocal of resistivity is________

ConductivityResistanceImpedanceConductance

25. Find the current in the 4 ohm resistor.

0A5A20A2.2A