211 SRI RAMAKRISHNA MISSION VIDYALYA POLYTECHNIC COLLEGE.

  India's Moon rover has taken first steps on the lunar surface a day after the country made history by becoming the first to land near the south pole. Chandrayaan-3's rover "ramped down" from the lander and "India took a walk on the Moon!", the space agency said. The Vikram lander successfully touched down as planned on Wednesday evening. With this, India joins an elite club of countries to achieve a soft landing on the Moon, after the US, the former Soviet Union and China. 26kg rover called Pragyaan (the Sanskrit word for wisdom) was carried to the Moon in the Vikram lander's belly. After the dust raised by last evening's landing had settled, panels on one side of Vikram opened to deploy a ramp to enable Pragyaan to slide down to the lunar surface. It will now roam around the rocks and craters, gathering crucial data and images to be sent back to Earth for analysis. Pragyaan is carrying two scientific instruments which will try to find out what min...

  Glucose Meter Diabetes is a big problem all over the world these days. To keep control of insulin levels in the blood glucose meter is necessary. Glucose meter calculates the glucose levels (sugar levels) in the blood accurately. Conclusion Medical electronics is a critical area where accurate and precise measurements have to be carried out. Sophisticated medical and healthcare devices have to be selected for precise analysis

       Raspberry Pi ( / p aɪ / ) is a series of small  single-board computers  (SBCs) developed in the  United Kingdom  by the  Raspberry Pi Foundation  in association with  Broadcom . The Raspberry Pi project originally leaned toward the promotion of teaching basic  computer science  in schools. The original model became more popular than anticipated, selling outside its  target market  for uses such as  robotics . It is widely used in many areas, such as for  weather monitoring , [8]  because of its low cost, modularity, and open design. It is typically used by computer and electronic hobbyists, due to its adoption of the  HDMI  and  USB  standards. After the release of the second board type, the Raspberry Pi Foundation set up a new entity, named Raspberry Pi Trading, and installed  Eben Upton  as  CEO , with the responsibility of developing techn...

   Lightning Arrester Definition:  The circuit which is protected from the strokes of lightning with the help of a  protection device  is known as lightning arrester.   lightning strokes are nothing but surges with high transient voltage, arcs of isolation, spark, and surge currents because of lightning, etc.  These devices are used to defend the power systems by forwarding the high voltage surges in the direction of the ground. And these power systems and over headlines can also be protected by using ground wire or the earthing from the direct strikes of lightning.  lightning-arrester The arrangement of these devices can be done on the towers, transmission poles and buildings to give a secure lane to the voltage & discharging current. 

  Oximeter Instead of using invasive methods to know the oxygen and pulse rate the better approach is to use an oximeter. Pulse oximeter reads the oxygen level and pulse rate in the blood and shows it on the graphical digital display. It is a painless method to know the amount of oxygen and pulse levels delivered to blood tissues. Applications Measures Accurate oxygen saturation in the blood Pulse rate measurement Measures oxygen levels in lungs, respiratory parts. To analyze Sleep apnea.

  Proximity Sensors A Proximity Sensor is a non-contact type sensor that detects the presence of an object.  Proximity Sensors can be implemented using different techniques like Optical (like Infrared or Laser), Sound (Ultrasonic), Magnetic (Hall Effect), Capacitive, etc. Some of the applications of Proximity Sensors are Mobile Phones, Cars (Parking Sensors), industries (object alignment), Ground Proximity in Aircrafts, etc.

  JFET or Junction Field Effect Transistor is one of the simplest types of field-effect transistor. Contrary to the Bipolar Junction Transistor, JFETs are voltage-controlled devices. In JFET, the current flow is due to the majority of charge carriers. However, in BJTs, the current flow is due to both minority and majority charge carriers. Since only the majority of charge carriers are responsible for the current flow, JFETs are unidirectional. The first working model of junction field-effect transistors was made in 1953. JFET Construction In an N-channel JFET, the material is of P-type, and the substrate is N-type, while in a P channel JFET the material is of N-type, and the substrate used is p-type. JFET is made of a long channel of semiconductor material. Ohmic contacts are provided at each end of the semiconductor channels to form source and drain connections. A P-type JFET contains many positive charges, and if the JFET contains a large number of electrons, it is called an N-ty...