ResistorS
- 2. 03/28/15 2 CREATED BY MOHAMMAD YOUSIF FROM UNIVERSITY OF LAHORE DEPARTMENT MECHANICAL ENGINEERING
- 3. 03/28/15 3 what is resisitor? A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
- 4. 03/28/15 4 Resistors act to reduce current flow. Resistors absorb power from a circuit and convert it into heat In electronic circuits resistors are used to limit current flow, to adjust signal levels.
- 5. 03/28/15 5 History of resisitor The Resistance was discovered by the year 1827 from Georg Simon Ohm, a German electrician. Ohm was born in Germany, in the city of Erlangen at 1787 and died at 1854.
- 6. 03/28/15 6 formula for resisitor and unit G.S.Ohm described this behavior and gave the name "Resistance". He then announced the Ohm's law that connects the resistance with the voltage and the current R=V/I mathemathical formula Here R is resisitancs V is volt and I is current. The unit of resisitance is ohm (Ω) as memorial to its inventor
- 7. 03/28/15 7 Working of resisitor • A resistor is a little package of resistance: wire it into a circuit and you reduce the current by a precise amount. From the outside, all resistors look more or less the same. As you can can see in photo, a resistor is a short, worm-like component with colored stripes on the side. It has two connections, one on either side, so you can hook it into a circuit.
- 8. 03/28/15 8 what is resisitance??? • the voltage in volts required to make a current of 1 amp flow through a circuit. If it takes 500 volts to make 1 amp flow, the resistance is 500 ohms (written 500 Ω). • V = I × R • This is known as Ohm's Law for German physicist Georg Simon Ohm (1789–1854).
- 9. 03/28/15 9 how resisitance works?? a ceramic rod running through the middle with copper wire wrapped around the outside. A resistor like this is described as wire-wound. The number of copper turns controls the resistance very precisely: the more copper turns, and the thinner the copper, the higher the resistance. It works by converting electrical energy into heat, which is dissipated into the air.
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- 11. 03/28/15 11 How to know the value of a resistor??
- 12. 03/28/15 12 Resisitor colour chart BLACK: 0 BROWN: 1 RED: 2 ORANGE: 3 YELLOW: 4 GREEN: 5 BLUE: 6 VIOLET: 7 GREY: 8 WHITE: 9 BLACK: 1 BROWN: 10 RED: 100 ORANGE: 1000 YELLOW: 10000 GREEN: 100000 BLUE: 1000000 GOLD: 0.1 SILVER: 0.01 BROWN: 1% RED: 2% GOLD: 5% SILVER: 10% NOTHING: 20%
- 13. 03/28/15 13 resistors in parallel and in series in circuit
- 14. 03/28/15 14