• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# 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

# Related AS and A Level Electrical & Thermal Physics essays

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

I will be discussing the following things in my analysis: 1. Resolution 2. Response Time 3. Systematic Drift 4. Random Variation 5. Sensitivity Resolution What is 'resolution'? According to http://scienceworld.wolfram.com/physics/Resolution.html, the resolution is "The size of the smallest element that can be separated from neighboring elements."

2. ## Investigation into the resistance of a filament lamp.

As a result, resistance of conductor increases. So therefore: (1) Increase in resistance of a conductor is directly proportional to original resistance. ?R ? R1..............(a) (2) Change in resistance is directly proportional to change in temperature. ?R ??T...(b) combining (a) and (b) we get: ?R ?R1. ?T ?R = (constant)

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

A way of reducing the effect of the heat losses, which remain, is to apply a cooling correction. In this experiment the temperature was recorded both during heating and after the heating as discontinued. The temperature was shown to vary in results two and three once the heat was discontinued, and the shapes of the graphs are as below.

2. ## A2 Viscosity investigation

Afore mentioned is all the limitations from the measuring devices used and a brief guide how to obtain maximum accuracy from this equipment. But there is still much to take into consideration such as the fact that air bubbles will affect the viscosity or rather what the viscosity will appear to be.

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. ## Investigating electrical behaviour and a filament lamp.

Variables: For this experiment I would expect to have 3 different variables, Independent, Dependent, and fixed variables, which all helps me to plan and explain the experiment thoroughly. Independent variable (which you can change): The thing that I will change in this experiment is the voltage from the power supply.

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