1.What is electricity? 2.What are the various sources of electricity?
3.
The difference between AC and DC electricity/power
4.How to ensure electrical safety for electrical equipment and for human beings

5.The difference between voltage and current in an electric circuit
6.What is an electrical load and what is meant by overload in electric circuits?

7.The principle of generation of AC electricity. How does an AC generator work, briefly?
8.The difference between single-phase and three-phase electricity
9.Discuss: generation, transmission, distribution, and consumption of electricity
10.Draw a single-line diagram for the electrical layout your household as per your understanding

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)