Determining the resistance of a bulb with a meter is inaccurate. Resistance of the filament lamp increase with temperature. Looking at my graph I decided that there are thee separate lines that could approximate the graph. In this way the slope of the graph is the resistance of the bulb. The resistance of the bulb increases as the current through the bulb … I'm unsure of a method as to how current affects resistance in a light bulb. This is because the current through the filament causes it to heat up, as the temperature of the filament changes the resistance also changes. Looking at my graph I decided that there are thee separate lines that could approximate the graph. Replace the filament bulb in the circuit with copper electrodes in copper sulfate solution. My hypothesis is correct my resistance changed due to the current passing through the filament bulb. - An Experiment to calculate the resistance of a lamp GCSE Keywords: Potential difference, Current, Amps, Volts Course overview This affects the filament molecules which a vibrating at a faster rate taking up more space. Doubling the amount of energy does not cause a current twice as fast. I came across articles that say the resistance of the filament changes with temperature. Reason: As the potential difference across a filament lamp increases, the current increases and the energy dissipated, as heat, increases, resulting in a higher temperature. The electrons in the current now collide more with the atoms. The resistance of the bulb increases as the current through the bulb increases. This increases the resistance of the bulb since the current has more obstacles in its way. More energy is needed to push the current through the filament. Conclusion. In this experiment you will use meters, power supplies, resistors and lamps in various circuits. The current through a filament lamp is not directly proportional to the potential difference. The resistance of the bulb increases as the current through the bulb … The slope of these three lines gives 3 different resistance values for the filament bulb. Looking at my graph I decided that there are thee separate lines that could approximate the graph. Short wires, or leads, are attached to the Hypothesis: I believe that a filament bulb will have an increasing resistance depending upon the current passing through it. As the temperature increases, resistance of the filament increases. Determining the resistance of a bulb with a meter is inaccurate. Analysis Evaluation. The filament is enclosed in a bulb to protect the filament from oxidation.Current is supplied to the filament by terminals or wires embedded in the glass. The slope of these three lines gives 3 different resistance values for the filament bulb. Investigating the Resistance of a 12 Volt Bulb When the Current Changes Prediction: I predict that as the current increases the temperature of the lamp will also increase; therefore the resistance will also increase. The filament has a positive temp. coefficient. Now, if the actual value was 1.7 ohms at rtp, then there would be a huge percentage uncertainty... the bulb used in the experiment approx. The hot filament then radiates a fraction of this energy in the form of light. How the Resistance of a Filament Bulb Varies Its Current Flowing through It Aim: the purpose of this investigation is to find out how the resistance of a filament bulb varies with current flowing through it. show 10 more Physics AS level - Electricity Metal filament question What quantity affects the brightness in a bulb? As the potential difference increases, the … This means its resistance rises with temperature. We can use this change in the resistance of the filament to measure … resistance and temperature Physic graphs iv graph of a filament bulb!! Hypothesis: I think the higher the voltage the brighter the bulb will be because then there will be an increase of current and the electrons The reason why I wanted to obtain this value is because I was doing an experiment for I-V characteristics of filament bulb. I'm unsure of a method as to how current affects resistance in a light bulb. Resistance, Ohm’s Law, and the Temperature of a Light Bulb Filament Name Partner Date Introduction Carbon resistors are the kind typically used in wiring circuits. 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