Question

Q27 Explain the principle, construction and working of electric motor with the help of diagram.
Q28Write three ways by which motor can be made more powerful?
Q29 Define Electromagnetism. What is the principle of generator?
Q30 Explain the construction and working of A.C generator.
Q31 How can you convert an A.C generator into D.C generator?
Q32 What is the frequency of A.C produced in India? How many times does current in India reverses
its direction in 1 sec.? A.C produced in India reverses its direction after every............ second.
Q33 Write five ways to increase the voltage produced by A.C generator.
Q34 A coil of insulated copper wire is connected to galvanometer What will happen if a bar magnate
is a) pushed into the coil b) held stationary inside the coil c) withdrawn from inside the coil.
Q35Explain why, the direction of induced current in coil of A.C generator changes after every half
revolution of the coil?
Q36 Explain Domestic electric circuits with the help of diagram.
Q37What is earthing? What is the purpose of earthing the electrical appliances?
Q38Why all the switches are put in live wire?
Q39 Explain a) short Circuiting b) Overloading.
Q40 Write the reading of light circuiting and power circuits in a house.
Q41 What is the importance of having two separate circuits in a house?
Q42 What is a fuse? A fuse is made up of which material?
Q43 A fuse should have a) (low/high)resistance than rest of wiring b)low/high melting point than
rest of wiring
Q44 Why fuse wire should be of tin plated copper wire ,not of copper wire?
045 In a house hold circuit, a fuse wire is connected in series or parallel?​

Answer 1

Answer:

• The physics of electricity and magnetism. An interaction between electricity and magnetism, as when an electric current or a changing electric field generates a magnetic field, or when a changing magnetic field generates an electric field.
• Electromagnetism is defined as phenomenon of interaction between the electric and magnetic fields generated by charged particles