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The IC 555 timer is a highly stable device for generating accurate time delay or oscillations. A  single timer can provide time delay ranging from microseconds to hours. The frequency of oscillation can be accurately controlled by external resistors and capacitors.There are totally 8 pins in this timer. Pin 1 is grounded. Pin 4 and 8 are shorted and then connected to the source. Output is taken at pin 3. Pin 2 an 6 are shorted and then connected to ground through a capacitor. Pin 7 is connected through a resistor to the power supply.

A Multimeter is an electronic measuring instrument that contributes several functions in one unit. The most basic instruments include ammeter, voltmeter, and ohmmeter. Analog multimeters are sometimes referred to as “volt -ohmmeters” abbreviated as VOM. A multimeter is a handheld device and used to find basic fault and for field service work. It can measure to seven or eight and a half digit of accuracy. Current, voltage and resistance measurements are considered standard features for multimeter. A multimeter may be implemented with an analog meter deflected by an electromagnet, as a classic galvanometer or with a digital display such as an LCD or vacuum fluorecent display.

The process of converting AC voltage and current to direct current is called rectification. An electronic device that offers a low resistance to current in one direction and a high resistance in the other direction is capable of converting a sinusoidal waveform into a unidirectional waveform. Diodes  have this characteistic, which makes it a useful component in the design of rectifiers. In order to achieve a constant DC voltage at the output, filtering should be done to the  pulsating DC output of the rectifier.

Soldering is the process of joining thin metal plates or wires made of steel, copper or brass. It is very commonly used to join wires in electrical work and mount electronic components on a circuit board.The joining material  used in soldering is called as solder or filled rod. An alloy of tin and lead is commonly used as the solder. The flux is used to clean the surface of the plates to be soldered. Aluminium chloride or zinc chloride is commonly used a flux. A good soldering iron is a variable temperature setting type with interchangeable irons and tips. Mostly it is used to join the small electronic items.

Logic gates are digital circuits  with one or more input signals and only one output signal. Gates are digital circuits because the input and output signals are either low or high voltages. Gates are often called logic circuits because they can be analysed using Boolean algebra. An AND gate can have two or more inputs but only one output. Its output can go to logic 1 if all its inputs are at the high state. An OR gate can have two or more inputs but only one output. Its output willbe at logic 1 if any or both of its inputs are at the high state.

An oscilloscope is electrinic test equipmentthat allows signal voltages to be viewed, usually as a two dimensional graph of one or more electrical potential differences plotted as a function of time or some other voltage. A typical oscilloscope is a rectangular box with a small screen, numerous input connectors and control knobs and buttons on the front panel. To aid measurement, a grid called the graticule is drawn on the face of the screen. Each square in the graticule  is known as a division. The signal to be measured is fed to one of the input connectors, which is usually a coaxial connector such as a BNC or N type.

Energy meter is a device used to measure the energy consumed in AC circuits. It has two electro magnetic coils made of silicon steel. The two coils are called current coil and pressure coil. An Aluminium disk revolves in it due  to the torque produced as a result of the flux. The number of revolution of the disk per K Wh is shown on the energy meter and is called energy meter constant. Energy meter revolution is equal to 1K Wh.To calculate the energy  consumed, take the time taken for known revolutions of disc.

Jan ingenhousz 1730-1799, a dutch scientist first discovered that plants take in carbon dioxide and release oxygen in sunlight but in the dark, plants take in oxygen and give out carbon dioxide like all other animals. Hans krebs then discovered what exactly happens when plants respire to release energy