(1)Explain with the help of a diagram the construction and working of an electric bell?
(2)Why is conservation of water important? Explain three method of conserve water.
Answers
1)An electric bell consists of an iron core, on which is wound a wire as a coil. ... The other terminal of the battery is connected to the screw contact with a switch in the middle. Working of an electric bell. Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet.
2)Water conservation includes all the policies, strategies and activities to sustainably manage the natural resource of fresh water, to protect the hydrosphere, and to meet the current and future human demand. Population, household size, and growth and affluence all affect how much water is used. Factors such as climate change have increased pressures on natural water resources especially in manufacturing and agricultural irrigation.[1] Many US cities have already implemented policies aimed at water conservation, with much success.[2]
The goals of water conservation efforts include:
Ensuring availability of water for future generations where the withdrawal of freshwater from an ecosystem does not exceed its natural replacement rate.
Energy conservation as water pumping, delivery and wastewater treatment facilities consume a significant amount of energy. In some regions of the world over 15% of total electricity consumption is devoted to water management.
Habitat conservation where minimizing human water use helps to preserve freshwater habitats for local wildlife and migrating waterfowl, but also water quality