Resistors
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This document discusses resistors. It begins by introducing resistors and their functions of reducing current flow and converting electrical power to heat. It then discusses the history of resistors dating back to their discovery in 1827 by Georg Ohm. Ohm's law relating resistance, voltage and current is also explained. The document goes on to describe the internal structure of resistors and how resistance works. It also discusses how to determine the resistance value of a resistor based on the color bands on it. Finally, it briefly mentions resistors in parallel and series circuits.
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This document discusses electrical resistance in conducting wires and Ohm's Law. It explains that resistance depends on the material, length, and cross-sectional area of the conductor. Resistance increases with length or smaller cross-sectional area. Ohm's Law states that voltage is directly proportional to current, and resistance can be calculated as voltage divided by current. The document provides examples and practice problems to illustrate these concepts.
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Some slides here were disorganized although I uploaded it on its good condition. Maybe some compression? or what? Howsoever, I think that it's readable and understandable enough.
Electricity and ohm’s law
Electric current is the flow of electrons through a conductive material like metal wires. It is measured in amperes. According to Ohm's law, the current (I) through a conductor is directly proportional to the voltage (V) and inversely proportional to the resistance (R). Ohm's law can be expressed as V=IR, where voltage equals current times resistance. Resistors are electrical components that control current in a circuit by providing resistance according to their material and construction.
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Resistors
- 2. 03/28/15 2 GROUP::B 1MOHAMMAD YOUSIF 2 KASHIF HASHMI 3 MUHAMMAD FUZAIL
- 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.
- 10. 03/28/15 10
- 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