TRB BT Assistant - Current Electricity and Kirchhoff’s Laws One Line Questions & Answers

1. What is the resistance of a conductor if a current of 0.5 A causes a voltage drop of 12 V across it? — 24 Ohms

2. A component has a voltage drop of 12V across it and dissipates 60W of power. What is the current flowing through it? — 5 A

3. If a current of 2 Amperes flows through a resistor of 5 Ohms, what is the voltage drop across the resistor? — 10 Volts

4. A loop in a circuit contains a 6V battery, a 2 Ohm resistor, and a 4 Ohm resistor in series. What is the current flowing through the loop? — 1 A

5. A simple circuit has a 5V battery and a 10 Ohm resistor. What is the current flowing through the resistor? — 0.5 A

6. A circuit consists of a 9V battery and two resistors in series, 3 Ohms and 6 Ohms. What is the current flowing through the circuit? — 1 A

7. A 10 Ohm resistor has a current of 2A flowing through it. What is the power dissipated by the resistor? — 40 W

8. A 12V battery is connected to a parallel combination of a 2 Ohm resistor and a 4 Ohm resistor. What is the current through the 2 Ohm resistor? — 6 A

9. A 12V battery is connected to a parallel combination of a 2 Ohm resistor and a 4 Ohm resistor. What is the current through the 4 Ohm resistor? — 3 A

10. What is the total current drawn from the battery in the previous question (12V battery, parallel 2 Ohm and 4 Ohm resistors)? — 9 A

11. A circuit has a junction where currents I1, I2, I3, and I4 meet. If I1 = 5A (in), I2 = 3A (out), I3 = 2A (in), what is I4? — 6A (in)

12. In a circuit, a junction has three branches. Currents of 5A and 3A are entering the junction, and a current of 2A is leaving. What is the current in the third branch? — 4A leaving

13. What is the equivalent resistance of two 10 Ohm resistors connected in parallel? — 5 Ohms

14. What is the equivalent resistance of two 10 Ohm resistors connected in series? — 20 Ohms

15. A wire has a resistance of 20 Ohms. If its length is doubled and its cross-sectional area is halved, what will be its new resistance? — 80 Ohms

16. In a circuit diagram, a resistor is typically represented by a zig-zag line. A battery is represented by: — Two parallel lines of unequal length

17. A device that measures potential difference is called a(n): — Voltmeter

18. What is the unit of electric potential difference (voltage)? — Volt

19. Kirchhoff's Voltage Law (KVL) is based on the principle of conservation of: — Energy

20. What is the property of a material that opposes the flow of electric current? — Resistance

21. A material with very high resistance is called a(n): — Insulator

22. Which of the following is NOT a component of Kirchhoff's laws? — Conservation of Mass

23. What is the term for the rate of flow of electric charge? — Electric current

24. Kirchhoff's Current Law (KCL) is based on the principle of conservation of: — Charge

25. According to Kirchhoff's Voltage Law, the algebraic sum of potential differences (voltages) around any closed loop or circuit is: — Zero

26. If the voltage across a component is doubled while its resistance remains constant, the current through it will: — Double

27. If the current through a resistor is doubled while its resistance remains constant, the voltage drop across it will: — Double

28. A parallel circuit has three resistors with resistances R1, R2, and R3. If the total current entering the parallel combination is I, and the currents through the resistors are I1, I2, and I3, what does KCL state? — I = I1 + I2 + I3

29. A material with very low resistance is called a(n): — Conductor

30. What happens to the total resistance of a circuit when more resistors are added in series? — It increases

31. What happens to the total resistance of a circuit when more resistors are added in parallel? — It decreases

32. In a circuit, if the voltage source is reversed, what happens to the current direction, assuming resistance remains constant? — It reverses direction

33. The unit of electric power is: — Watt

34. What is the fundamental difference between Kirchhoff's Current Law and Kirchhoff's Voltage Law in terms of the physical quantities they conserve? — KCL conserves charge, KVL conserves energy

35. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points? — Ohm's Law

36. In a complex circuit, a point where three or more conductors meet is called a: — Junction (or Node)

37. Kirchhoff's laws are particularly useful for analyzing circuits that are too complex to be solved using: — Both A and B

38. Power consumed by a resistor can be calculated using P = VI. Using Ohm's Law (V=IR), which other formulas for power are valid? — P = I^2R and P = V^2/R

39. An ammeter should be connected in ______ with the component through which the current is to be measured. — Series

40. When applying KVL to a loop, if you traverse a resistor in the direction of the current, the voltage change is considered: — Negative

41. When applying KVL to a loop, if you traverse a resistor against the direction of the current, the voltage change is considered: — Positive

42. When applying KVL to a loop, if you traverse a voltage source from negative to positive terminal, the voltage change is considered: — Positive

43. When applying KVL to a loop, if you traverse a voltage source from positive to negative terminal, the voltage change is considered: — Negative

44. A voltmeter should be connected in ______ with the component across which the potential difference is to be measured. — Parallel

45. Which of the following is a necessary condition for applying Kirchhoff's laws? — The circuit must be in a steady state

46. Consider a series circuit with a battery and resistors R1 and R2. If the voltage of the battery is V, and the voltage drops across R1 and R2 are V1 and V2 respectively, what does KVL state? — V = V1 + V2

47. What is the SI unit of electric current? — Ampere

48. What is the unit of electrical resistance? — Ohm

49. A device that measures electric current is called a(n): — Ammeter

50. According to Kirchhoff's Current Law, the algebraic sum of currents entering a junction is equal to the algebraic sum of currents leaving the junction. This can be expressed as: — ΣI_in = ΣI_out

Current Electricity and Kirchhoff’s Laws - One Line Questions