Free TN LLE Electrical Theory Questions and Answers 1 — Questions and Answers
Question 1: What is Ohm's Law?
- 𝑉 = 𝐼2𝑅
- P = IV
- V = IR (Correct answer)
- E = mc2
Correct answer: V = IR
Ohm's Law describes the fundamental relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The correct formula, V = IR, states that the voltage across a conductor is directly proportional to the current flowing through it, given a constant resistance. This law is essential for analyzing and designing electrical circuits.
Question 2: In a series circuit, if you add more resistors, what happens to the total resistance?
- It decreases
- It remains the same
- It increases (Correct answer)
- It doubles
Correct answer: It increases
In a series circuit, components are connected end-to-end, forming a single path for current. When more resistors are added in series, their individual resistances directly add up to the total resistance of the circuit. Therefore, adding more resistors always causes the total resistance to increase.
Question 3: What is the primary characteristic of a parallel circuit?
- The current is the same through all components
- The voltage is the same across all components (Correct answer)
- The power consumption is constant
- The total resistance is the sum of individual resistances
Correct answer: The voltage is the same across all components
A parallel circuit is characterized by multiple paths for current, where all components are connected across the same two points. This configuration ensures that the voltage drop across each component in parallel is identical. While current divides among the branches, the voltage remains constant across them.
Question 4: What unit is used to measure electrical power?
- Volt
- Ampere
- Watt (Correct answer)
- Ohm
Correct answer: Watt
Electrical power is the rate at which electrical energy is transferred or consumed. The standard unit used to measure electrical power is the Watt (W). One Watt is defined as one joule per second, representing the rate of energy conversion.
Question 5: Which component is used to store electrical energy in an electric field?
- Resistor
- Transformer
- Inductor
- Capacitor (Correct answer)
Correct answer: Capacitor
A capacitor is an electrical component designed to store electrical energy in an electric field. It consists of two conductive plates separated by a dielectric (insulating) material. When a voltage is applied, charge accumulates on the plates, storing energy that can be released later.
Free TN LLE Electrical Theory Questions and Answers 1
What is Ohm's Law?