Define Solar energy.
Communicable diseases, also known as infectious diseases or transmissible diseases, are illnesses caused by pathogens such as bacteria, viruses, fungi, or parasites that can be transmitted from one person to another, directly or indirectly. These diseases spread through various modes of transmissionRead more
Communicable diseases, also known as infectious diseases or transmissible diseases, are illnesses caused by pathogens such as bacteria, viruses, fungi, or parasites that can be transmitted from one person to another, directly or indirectly. These diseases spread through various modes of transmission, including person-to-person contact, airborne droplets, ingestion of contaminated food or water, and vector-borne transmission via insects or animals.
The transmission of communicable diseases can occur through several routes:
Direct Contact: This involves physical contact with an infected person, such as touching, kissing, or sexual intercourse.
Indirect Contact: This occurs through contact with contaminated objects or surfaces, such as doorknobs, shared utensils, or contaminated needles.
Airborne Transmission: Some pathogens can be spread through respiratory droplets expelled when an infected person coughs, sneezes, or talks, leading to inhalation by others.
Vector-borne Transmission: Certain diseases are transmitted through vectors such as mosquitoes, ticks, or fleas that carry and transmit the pathogens to humans.
Common examples of communicable diseases include influenza (flu), tuberculosis, HIV/AIDS, malaria, hepatitis, measles, and COVID-19. Prevention and control of communicable diseases often involve measures such as vaccination, good hygiene practices, quarantine and isolation, vector control, and public health interventions aimed at interrupting transmission pathways and reducing the spread of infections within communities.
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Solar energy refers to the radiant energy emitted by the Sun, which can be harnessed and converted into usable forms of energy such as heat or electricity. This renewable energy source is abundant and freely available, making it a sustainable alternative to fossil fuels for meeting various energy neRead more
Solar energy refers to the radiant energy emitted by the Sun, which can be harnessed and converted into usable forms of energy such as heat or electricity. This renewable energy source is abundant and freely available, making it a sustainable alternative to fossil fuels for meeting various energy needs.
There are two primary methods of harnessing solar energy:
Solar Thermal Energy: Solar thermal systems capture sunlight and convert it into heat energy. This can be achieved using solar collectors, which absorb sunlight to heat a fluid (such as water or oil) that can then be used for space heating, water heating, or industrial processes.
Solar Photovoltaic (PV) Energy: Solar PV technology directly converts sunlight into electricity using semiconductor materials (such as silicon) in solar panels. When sunlight strikes the solar cells, it generates an electric current through the photovoltaic effect, producing clean and renewable electricity.
Solar energy offers numerous benefits, including:
Overall, solar energy represents a promising renewable energy solution with the potential to contribute significantly to the transition towards a sustainable and low-carbon energy future.
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