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Yogita Ingle 7 years, 6 months ago
An electric bell consists of an iron core, on which is wound a wire as a coil. One end of the coil is connected to one terminal of a battery, and the other end to a steel rod that acts like a spring for the hammer touching the screw contact. 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. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.
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Yogita Ingle 7 years, 6 months ago
There are two law of reflection of light which are applicable both in the reflection of light from the plant mirrors or from spherical mirrors. These are:
First Law of Reflection: The incident ray, the reflecting ray and normal at the point of incidence; all lie in the same plane.
Second Law of Reflection: Angle of incidence is always equal to the angle of reflection. In the given figure; the angle of incidence is shown by blue colour and the angle of reflection is shown by red colour.
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Yogita Ingle 7 years, 6 months ago
Unicellular organisms are those organisms which are made up of a single cell. Some of the common examples of unicellular organisms are amoeba, paramecium, etc. Plant respire through stomata and lenticels whereas animals respire through lungs, gills and skin. But talking about respiration in unicellular organisms, there is no such respiratory organ. The respiration in unicellular organisms takes place through their general body surfaces or cell membrane. There is an exchange of oxygen and carbon dioxide through the body surface by the process of diffusion. Diffusion is the process of movement of a substance from higher concentration to the lower concentration.
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Yogita Ingle 7 years, 6 months ago
The liver is one of the digestive glands and plays an important role in the digestive system. It is the largest gland of the human body. It is located in the abdominal cavity. The liver is connected to the two following large blood vessels.
(i) Hepatic vein – It is used to carry the blood, which is rich in oxygen.
(ii) Portal vein – It is used to carry the blood, which is rich in digested nutrients.
The liver consists of two hepatic lobules which are made up of hepatic cells. Lobules are the structural and functional unit of the liver. Each lobule is overlaid by the Glisson’s capsule which is a thin connective tissue. Hepatic cells secrete the bile and pass into the gallbladder through the hepatic ducts. The hepatic duct from the liver and cystic duct from the gallbladder forms the common bile duct.
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Harshit Bansal 7 years, 6 months ago
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