1. Q: What is the definition of electric current?
A: Electric current is the flow of electric charge.
2. Q: What is the unit of electric current?
A: The unit of electric current is the ampere (A).
3. Q: What is the difference between DC and AC?
A: DC (direct current) flows in one direction, while AC (alternating current) changes direction periodically.
4. Q: What is the importance of electric current?
A: Electric current is essential for many modern technologies.
5. Q: What is the relationship between voltage, current, and resistance?
A: Voltage (V), current (I), and resistance (R) are related by Ohm's law: V = IR.
11. Q: What is the heating effect of electric current?
A: The heating effect of electric current is the production of heat when electric current flows through a conductor.
12. Q: What is the principle of an electric heater?
A: An electric heater works on the principle of the heating effect of electric current.
13. Q: What is the importance of the heating effect of electric current?
A: The heating effect of electric current is essential for many applications, including heating and cooking.
14. Q: What is the difference between a heating element and a conductor?
A: A heating element is designed to produce heat when electric current flows through it, while a conductor is designed to carry electric current with minimal resistance.
21. Q: What is the magnetic effect of electric current?
A: The magnetic effect of electric current is the production of a magnetic field when electric current flows through a conductor.
22. Q: What is the principle of an electromagnet?
A: An electromagnet works on the principle of the magnetic effect of electric current.
23. Q: What is the importance of the magnetic effect of electric current?
A: The magnetic effect of electric current is essential for many applications, including motors and generators.
24. Q: What is the difference between a permanent magnet and an electromagnet?
A: A permanent magnet retains its magnetic field forever, while an electromagnet is created by an electric current.
31. Q: What is electromagnetic induction?
A: Electromagnetic induction is the production of an electromotive force (EMF) across an electrical conductor in a changing magnetic field.
32. Q: What is the principle of a generator?
A: A generator works on the principle of electromagnetic induction.
33. Q: What is the importance of electromagnetic induction?
A: Electromagnetic induction is essential for many applications, including generators and transformers.
34. Q: What is the difference between a generator and a motor?
A: A generator converts mechanical energy into electrical energy, while a motor converts electrical energy into mechanical energy.
41. Q: What are some applications of electric current?
A: Electric current has many applications, including lighting, heating, and power generation.
42. Q: What is the importance of electric current in our daily lives?
A: Electric current is essential for many modern technologies and is used in many applications.
43. Q: What are some safety precautions when working with electric current?
A: When working with electric current, it is essential to follow safety precautions, including using insulated wires and avoiding water.
44. Q: What is the difference between a fuse and a circuit breaker?
A: A fuse is a device that melts when excessive current flows, while a circuit breaker is a device that automatically switches off when excessive current flows.
45. Q: What is the importance of earthing in electrical circuits?
A: Earthing is essential for safety, as it provides a path for electric current to flow to the ground in case of a fault.
46. Q: What is the difference between a series circuit and a parallel circuit?
A: A series circuit has components connected one after the other, while a parallel circuit has components connected between the same two points.
47. Q: What is the importance of electric current in industry?
A: Electric current is essential for many industrial applications, including power generation and transmission.
48. Q: What are some advantages of using electric current?
A: Electric current has many advantages, including convenience, efficiency, and safety.
49. Q: What are some disadvantages of using electric current?
A: Electric current has some disadvantages, including the risk of shock and the potential for environmental harm.
