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WORKSHOP PRACTICE

WORKSHOP PRACTICE. WEEK-4. OBJECTIVE OF LAB-3. To be familiar with a light bulb. To be familiar with the series circuits To be familiar with the parallel circuits. ELECTRONS ENERGY.

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WORKSHOP PRACTICE

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  1. WORKSHOP PRACTICE WEEK-4

  2. OBJECTIVE OF LAB-3 • To be familiar with a light bulb. • To be familiar with the series circuits • To be familiar with the parallel circuits.

  3. ELECTRONS ENERGY • But if they are heated to a high enough level around 4,000 degrees Fahrenheit or (2,200 degrees C) in the case of a light bulb -- they will emit a good deal of visible light. Metal atoms release mostly infrared light photons, which are invisible to the human eye.

  4. CIRCUIT The configuration of electric components and active sources such that there is a flow of current is called an Electric Circuit.

  5. SERIES CIRCUITS

  6. PARALLEL CIRCUITS

  7. LIGHT BULB • A light bulb, or electric light or electric lamp is a device that produces light from electricity. • In addition to lighting a dark space.

  8. APPLICATION OF LIGHT BULB It will be used as follows: • Indicator • To direct traffic • Status of electronic circuits • Or many other applications

  9. LIGHT BULB STRUCTURE

  10. fluorescent lamp • A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.

  11. A preheat fluorescent lamp circuit using an automatic starting switch. A: Fluorescent tube, B: Power (+220 volts), C: Starter, D: Switch (bi-metallic thermostat), E: Capacitor, F: Filaments, G: Ballast

  12. This technique uses a combination filament–cathode at each end of the lamp in conjunction with a mechanical or automatic (bi-metallic) switch (see circuit diagram to the right) that initially connect the filaments in series with the ballast to preheat them; when the arc is struck the filaments are disconnected. This system is described as preheat in some countries and switchstart in others. These systems are standard equipment in 200–240 V countries (and for 100–120 V lamps up to about 30 watts

  13. Energy Saver (Compact Fluorescent Lamp) Electronic Blast Circuit

  14. Fluorescent lights make their light energy in a three-step process: • Electrodes take electrical energy from the power supply and generate moving electrons. • The moving electrons collide with mercury atoms in the tubes to make ultraviolet light. • The white phosphor coating of the tubes converts the ultraviolet light into visible light (that we can see).

  15. SERIES & PARALLEL CIRCUITS ANIMATION • http://www.physics-chemistry-interactive-flash-animation.com/electricity_electromagnetism_interactive/components_circuits_association-series_parallel.htm

  16. SHORT CIRCUIT ACTIVITY • http://www.physics-chemistry-interactive-flash-animation.com/electricity_electromagnetism_interactive/short_circuit_an_activity.htm

  17. WHY SHORT CIRCUIT IS SO DANGEROUS ? • http://www.physics-chemistry-interactive-flash-animation.com/electricity_electromagnetism_interactive/short_circuit.htm

  18. HOW TO DRAW A SIMPLE CIRCUIT DIAGRAM • http://www.physics-chemistry-interactive-flash-animation.com/electricity_electromagnetism_interactive/circuits_diagram.htm

  19. THE END

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