Resistors in series and parallel Essay

September 20, 2017 Physics

Resistors are used in assorted existent life applications to execute undertakings that involve: restricting the current that goes through a subdivision of a circuit. presenting a electromotive force bead in a circuit. bring forthing heat and the protection of constituents of a circuit. It is of import to cipher the opposition of resistances so that the electrical circuits produced utilizing them will execute in the mode that their maker wanted them to. If the incorrect resistance/resistor is used so delicate constituents that need merely a comparatively little sum of current may be destroyed.

All resistances have a degree of tolerance. This is to let for imperfectnesss in the manufactured object. It was determined through experimentation that all of the resistances that were used in this experiment were within their tolerance scope with the exclusion of R4 ( See Table 1 ) . This resistance had a nominal value of 1600 ohms and a tolerance of +/-5 % . This means that this resistance should hold had a value within the scope of 1520-1680 ohms. nevertheless the existent opposition was found to be 1798 ohms. It is possible that this may hold been due to a fabrication mistake or a labelling mistake.

The sum predicted opposition was determined by utilizing the series and parallel resistance Torahs and the opposition values of the assorted constituents of the circuit. The tolerance scope for the circuit was predicted to be between 1847. 3-2319. 2 ohms. Through experimentation the existent sum opposition for the circuit was 2216. 62 ohms. this value was within the predicted scope.

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The existent opposition value of constituent 1 was 263. 26 ohms ; this was within the predicted scope ( 271. 36-245. 51 ohms ) .

The existent opposition value of constituent 2 was 1764. 26 ohms ; this was within the predicted scope ( 1664. 24-1846. 36 ohms ) .

The existent opposition value of constituent 3 was 2216. 62 ohms ; this was within the predicted scope ( 2319. 20 and 1847. 3 ohms ) .

The existent opposition of the resistances was found by utilizing a multimeter. Some systematic mistake may hold occurred in this experiment if the multimeter was non calibrated right during proving.

Temperature fluctuations may hold caused incompatibilities in this experiment. The ground why opposition occurs is that a metal consists of lattice of atoms that each has a shell of negatrons. The metal is a music director because the negatrons are free to disassociate from their parent atoms and travel through the lattice. When a electromotive force is applied the negatrons impetus from one side of the metal to the other. In existent stuff imperfectnesss scatter the negatrons ensuing in opposition. Temperature is able to impact opposition because temperature causes the atoms to vibrate more strongly making even more hits and further increasing the opposition.


The purpose of the experiment was to compare the predicted and existent opposition in the circuit of resistance combinations in series and parallel. The consequences of this experiment found that the series and parallel resistance Torahs were moderately good indexs of the “real world” values of opposition for circuits that contained resistances in series and parallel. One illustration of this was that the entire opposition of the circuit made was found to be 2216. 62 ohms which was within the predicted scope ( this predicted scope was calculated by utilizing the upper and lower tolerance values for the resistances used in the circuit. From the informations obtained it can hence be seen that all three resistance Torahs stated in the Background subdivision of this study are rather utile in ciphering theoretical values for the opposition of circuits in series and parallel that are close to the “real world” values.


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“resistor. ” WordNet 1. 7. 1. Princeton University. 2001.

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“resistor. ” Electronics. Twysted Pair. 2001.

Available: hypertext transfer protocol: //www. replies. com/topic/resistor-1. 24 Jul. 2005.

Storen. A and Martine. R. ( 2000 ) Nelson Physics VCE Units 3 and 4. Nelson Publication: Sydney. ( pp 221-226 )


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