This is going to be your first set of questions for this course, so I felt it necessary to let you know that the questions and answers that you have are written in a way to be more educational than simply testing your knowledge at each stage. As in every college assignments form an essential part of the learning, and as such, I don’t want you to consider it as a test, but rather a learning curve. Therefore if you see questions and answers that have not been explained previously in the relevant module, this will either be explained further in the following modules or is purposely put there to advance your learning.
1. What is electrical charge?
- Answer: Electrical charge is a property of certain particles, such as electrons and protons, that causes them to experience a force when placed in an electric field. Charge can be positive or negative.
2. What is potential difference (P.D) in an electrical circuit?
- Answer: Potential difference, also known as voltage, is the difference in electric potential between two points in a circuit. It drives the flow of electric current.
3. What is conductance?
- Answer: Conductance is a measure of how easily electricity flows through a material. It is the reciprocal of resistance.
4. What is a conductor?
- Answer: A conductor is a material that allows electric charge to flow through it easily, such as metals like copper and aluminum.
5. What is an insulator?
- Answer: An insulator is a material that does not allow electric charge to flow through it easily, such as rubber, plastic, or glass.
6. What is the unit of electric charge?
- Answer: The unit of electric charge is the coulomb (C).
7. What is the rate at which electrical energy is transferred at a given point?
- Answer: The rate at which electrical energy is transferred is known as power, and it is measured in watts (W).
8. What is conventional current flow?
- Answer: Conventional current flow is the flow of positive charge from the positive terminal to the negative terminal of a power source. This is opposite to the actual flow of electrons, which is from negative to positive.
9. What is resistance in an electrical circuit?
- Answer: Resistance is a measure of how much a material opposes the flow of electric current. It is measured in ohms (Ω).
10. What is Ohm’s Law?
- Answer: Ohm’s Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them (V = IR).
11. What is the unit of potential difference (voltage)?
- Answer: The unit of potential difference is the volt (V).
12. What is the relationship between conductance and resistance?
- Answer: Conductance is the reciprocal of resistance. If a material has high resistance, it has low conductance, and vice versa.
13. What is the role of electrons in electricity?
- Answer: Electrons are the primary charge carriers in an electric current. In a conductor, electrons move from the negative terminal to the positive terminal, creating an electric current.
14. What is static electricity?
- Answer: Static electricity is the accumulation of electric charge on the surface of an object, usually caused by friction.
15. What is the unit of conductance?
- Answer: The unit of conductance is the siemens (S).
16. What is the purpose of a fuse in an electrical circuit?
- Answer: A fuse is a safety device that protects an electrical circuit by breaking the circuit if the current flowing through it exceeds a certain level.
17. What is the difference between AC and DC current?
- Answer: AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction only.
18. Why is copper commonly used in electrical wiring?
- Answer: Copper is commonly used in electrical wiring because it has high electrical conductivity, meaning it allows electric current to flow easily.
19. What is the role of a battery in a circuit?
- Answer: A battery provides the energy needed to move electrons through a circuit, creating an electric current.
20. What is the function of a resistor in a circuit?
- Answer: A resistor limits the flow of electric current in a circuit, protecting components from excessive current.