• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

An Investigation of the Chemical Behaviour of a Light bulb Filament

Extracts from this document...

Introduction

An Investigation of the Chemical Behaviour of a Light bulb Filament I will plan to see if there is a relationship between the current, the potential difference, the resistance and the temperature of a light bulb filament. Safety:- The Current- This is not a major problem as the current is so small that it will not harm anyone if you come into contact with it. Heat- By this I mean the heat which will be produced by the light bulb. Again this will not be a problem as the hot part of the bulb is the filament which is protect by a glass dome. Breakage's- This is almost solely based upon the possible breakage of the light bulb's glass dome. This should not cause any problems as most bulbs produce a rounded edge if the glass break. My Equipment:- 1 0.3amp bulb 3 3.5volt batteries 1 Variable resistor 1 Ammeter 1 Voltmeter (I will also need 6 double ended crocodile clip wires) ...read more.

Middle

There is a formula that I will use to find out the temperature. It is R = R (1 + 0.04 x ) A Fair Test:- To ensure that I carry out a fair test I must:- * Use the same equipment if I need to redo parts of the experiment later on. If I fail to do this, my results may change and become abnormal to the rest of my results. * Make sure that the batteries are fully recharged. I f this task is failed to be completed it may reduce the amount of results that I am able to acquire because of the reduction of the amount of amps. * I must repeat my results for 2 or maybe 3 times so I can find an average, therefore making my results more accurate. My Predictions:- My predictions are that when the potential difference increases the current also increases. This means the resistance increases and therefore the temperature increases as well. ...read more.

Conclusion

My Evaluation:- The experiment that I carried out was obviously is not completely accurate as it is only a school experiment and the school do not have the equipment or the funds to carry out a 100% accurate experiment. This version of the experiment produced a valid set of results which supported my original hypothesis. There were the odd few results which were irregular or out of the ordinary. There were not enough of these to warrant the experiment having to be redone. Changes that I would make are to find a more accurate way of recording the temperature. I think this is a problem because to find out the temperature you are basing it solely on your results from the current, potential difference and resistance. So if any of these results are wrong your temperature could be very irregular, this could also be said about the resistance. I think that the evidence that I have found supports a firm conclusion, I think this because my results support the text book results and there are no major irregularities. ?? ?? ?? ?? Derek Pollard 5M Page 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. Using an LDR to detect the intensity of plane polarised light allowed through a ...

    However, our intensities are too high by 9.5 lux so, we want this new value to be equal not to the actual intensity, but the intensity minus ambient light, therefore, substituting I with I - 9.5, we can work our way back from: Which we can then change in terms

  2. Investigation into the resistance of a filament lamp.

    Resistance of a conductor is directly proportional to temperature. This is because with the increase in temperature, vibration motion of the atoms of conductor increases. Due to increase in vibration, probability of collision between atoms and electrons increases. As a result, resistance of conductor increases.

  1. The aim of my investigation is to determine the specific heat capacity of aluminium.

    have been included as all aluminium has the same specific heat capacity. As previously stated the thermometer and heating filament are not included in the mass, this may have some effect on the results as both of these instruments take in or contain some of the heat, which reduces the heat within the aluminium block its self.

  2. A2 Viscosity investigation

    which the ball bearing will have to break through in order to travel through which will slow the ball bearing down thus making it appear more viscous. For the purpose of this investigation I am going to assume that these effects cancel each other out therefore having no effect.

  1. Choosing a light source

    Fluorescent bulbs cast light in pulsating waves. When used in temperatures below 50-degrees F, this can cause an annoying "flickering" effect. Advantages of fluorescent tube lights: They are cooler to touch, they spread light over large areas without excessive glare, and they last 10 to 20 times longer than incandescent bulbs.

  2. Investigating the resistance variation of filament bulbs.

    line, when at a constant temperature, so if the temperature increases the gradient will get less steep, this is what I expect my graph to look like. Results Table P.D. (V) Current (A) Resistance (Ohms) P.D. (V) Current (A) Resistance (Ohms )

  1. To Investigate How the Resistance of the Light Dependent Resistor Depends On the Current ...

    As the voltage stays the same here, so the current, which is equal voltage divide by the resistance increases as well. The reason why V2 decreases is that when the current in the circuit increases, the voltage of R2 increases as V=IR and R keep the same.

  2. Build a successful sensor that will measure the proximity of a light source.

    calculated at any given distance from the photodiode, using any relationship found between the resistance and the distance from light, e.g. Light intensity. The above formula relates directly to Ohm's law. Ohm's law states that 'Conductance or resistance can be calculated at any given current or voltage.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work