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The Change in Resistance of a Carbon Paper

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The Change in Resistance of a Carbon Paper

 

Change in resistance of carbon paper Introduction The purpose of this experiment is to understand how the resistance of carbon coated paper changes when different variables change. Variable is an experimental change that can change the result of the experiment, the main variables of this experiment are paper type, width, length, and temperature. We will consider ways to change the width of paper to affect resistance. Therefore, in order to guarantee fair testing, do not change all other variables, as the results may be affected and experimented.How to Implement the Change Process Essay.

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The filament of the first successful bulb was made of carbon (carbonized paper or bamboo). Early carbon filaments have a negative temperature coefficient – the electrical resistance decreases as the temperature rises. This makes the lamps sensitive to fluctuations in the power supply, since a slight increase in voltage will cause the filaments to heat up, lower their resistance, and absorb more power and heat. During the “flash” process, carbon filaments are heated therethrough in a vacuum vessel containing hydrocarbon vapors, typically gasoline. The carbon deposited on the filaments by this treatment improves the uniformity and strength of the filaments and their efficiency. The metallized or “graphitized” filaments are first heated in a high temperature oven prior to flushing and lamp assembly. It converts carbon to graphite and further strengthens and smoothes filaments

Carbon filament bulb has opposite characteristics. Resistance of carbon filament is higher during cooling than during operation. For a 240 volt, 60 watt carbon filament bulb, the filament has a resistance of 960 ohms at operating temperature but rises to about 1500 ohms when cooled. Incandescent light bulbs have various shapes and sizes. The name of the shape varies from region to region. Many of these shapes have names consisting of one or more letters followed by one or more numbers (for example, A 55 or PAR 38). Characters represent the shape of a light bulb. The number represents the maximum diameter of 1/8 inch or 1 mm depending on shape and area. For example, the 63 mm reflector is named R 63 but in the US it is called R 20 (2.5 inch). However, in both regions the PAR 38 reflector is called PAR 38.How to Implement the Change Process Essay.

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