Question

(a) What are geothermal energy hot-spots?
b) Name two countries, other than India, where power plants based on geothermal energy are operational,
c) Name the phenomenon that explains the working of an electric
generator.
(d) State an important advantage of using AC over DC.
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Answer 1

Answer:

1. The spots from where geothermal energy can be extracted is called geothermal hot spots.
2. China and Japan.
3. Electro magnetic induction.
4. AC can transmit electricity over long distances without much loss of energy.

Answer 2

(a) The energy in form of steam is trapped inside the earth. Such spots are known as geothermal spots from where geothermal energy is generated.  

(b) Indonesia and Iceland are some of the countries where geothermal power plants are operational.  

(c) The electric generator is based on principals of Electro magnetic induction.

(d) Due to step up and step down voltages, its easy to transfer AC over great distance than DC.