Question

11. (a) name the device used to convert
(1) Solar energy in to heat and
(ii) solar energy in to electricity.
(b) explain the working of windmill
12. What is biogas? How can biogas be obtained? Why is the use of biogas obtained
from cow dung advised in preference to burning of cow dung cakes?​

Answer 1

Answer 11 :-

A1.A photovoltaic cell, commonly called a solar cell or PV, is the technology used to convert solar energy directly into electrical power.

B. A windmill converts wind energy into rotational energy by means of its blades. The basic principle of every windmill is to convert kinetic energy of wind into mechanical energy which is used to rotate the turbine of electrical generator to produce electricity.

Answer 12 :- The burning of cow dung cakes causes environmental pollution. While biogas obtained from cow dung is a clean fuel and helps in providing energy and it also provides good quality manure for agriculture.

Explanation

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Answer 2

Explanation:

11 the device name which is used to convert the solar energy into heat is the solar heater a device used to convert the solar energy into the electricity is equal to electric heater biogas is the gas or domestic fuel made by the animal dung animal waste Methane Gas carbon dioxide acceptor in biogas is obtained by the chemical reaction of chlorination and domestic aggregations