Aim- To investigate the affect of changing the length of wire of resistance.
Science Coursework Planning > Title- Resistance of a wire > Aim- To investigate the affect of changing the length of wire of resistance. > Apparatus- * Crocodile wires * Wires; Copper, Aluminum * Amp meter * Volt meter * Battery > Method- 1) Attach your wires, crocodile clips, amp meter, voltmeter and battery as shown in the diagram above. 2) Turn on power of the battery 3) Take reading from amp meter and volt meter 4) Find the resistance with this Formula: R=V/I 5) Take down results > Prediction- I think when the wire gets longer the resistance will increase. The copper will probably have a lower resistance seeing it is a very good conductor and usually used in electrical wires. Aluminum will have a higher resistance because it is not such a good conductor and is not usually used for conducting. Observation > Result table Aluminum Length (cm) Volts Amps Resistance (?) 40 0.39 0.36 .08 30 0.34 0.31 .1 20 0.29 0.16 .81 0 0.16 0.14 .14 Copper Length (cm) Volts Amps Resistance (?) 40 0.38 0.43 0.88 30 0.31 0.28 0.85 20 0.21 0.17 .23 0 0.2 0.09 2.2 > Analysis Aluminum Copper > Evaluation This experiment was very limited and could not find enough data on the experiment and is therefore not very accurate. The Copper does have a lower resistance level than the aluminum there is enough evidence above to show that.
Power out put of a light bulb
Power out put of a light bulb Light Basic Light is a form of energy that can be released by an atom. It is made up of many small particles, these particles are called light photons. They are the most basic units of light. Atoms release light photons when their electrons which are the negatively charged particles that move around an atom's nucleus, becomes excited. Light bulbs have a simple structure. At the bottom, they have two metal contacts, which connect to the ends of the electrical circuit. The metal contacts are attached to two wires, which are attached to a thin metal string. The string sits in the middle of the bulb and is held up by a glass mount. The wires and the strings are contained in a glass bulb, which is filled with still gas, such as argon. When the bulb is hooked up to a power supply, an electric current flows from one contact to the other, through the wires and the string. As the electrons move along through the string, they are continuously bumping into the atoms that make up the string. The energy of each collision vibrates the atom. A thinner conductor heats up more easily than a thicker conductor because it is more resistant to the movement of electrons. The filament in a light bulb is made of a long, thin length of tungsten metal. In a 60-watt bulb, the tungsten filament is about 2 meters long but only about one hundredth of an inch thick.
Physics investigation – Factors Affecting Resistance
Physics investigation - Factors Affecting Resistance Aim : T o find out how the varying length of a wire affects the amount of resistance Method * Get all equipment together that will be required; a power pack, a rheostat, voltmeter, ammeter, Constantium wire, leads and crocodile clips and check that all of these work correctly before setting up circuit as below Variable length of wire * Check that the circuit works correctly and that all wires are connected correctly, positive to negative and in correct places * Throughout the experiment, use wire that is made of the same metal and make sure that you always use metal that has the same diameter to keep it a fair test * Starting with a length of wire that is 10 cm long, connect this with crocodile clips at each end of the wire into the circuit in the place as shown above * Using the rheostat to vary the voltage and measuring accurately with the voltmeter, set the voltage first to 3V and record, using the ammeter accurately, the current * Then repeat this, setting the voltage next to 4V and then to 5V, checking readings each time * Repeat this process of three readings with lengths of wire that are 20,30,40,50,60,70,80,90 and 100 cm long, making sure that you take readings as accurately as possible to make sure that final results are precise * Put all results into a table, calculating resistance with a calculator
To investigate how the electrical resistance of a wire changes in relationship to its length.
Physics coursework Aim: To investigate how the electrical resistance of a wire changes in relationship to its length. Prediction: I think that as the length of the wire increases so to will the resistance of it. I also believe that the rate of the resistance will be in proportion to the length of the wire, for example if the length of the wire is doubled then so will the resistance. Apparatus: * Lab pack * Wires * Ammeter * Voltmeter * Crocodile clips * Wires to test (different lengths) * 1000ml Boiling jug Diagram: Physics coursework Method: . Set up apparatus as diagram shows on previous page. 2. I connected a wire with the thickness of 0.56 mm and a length of 600mm (to start with) to the crocodile clips to the ends of the wire. 3. I put the wire in the water. 4. I then switched the voltage around from 0 to 15 on the lab pack to give me a measurement in amps which gave me my current. 5. I repeated this with the same thickness of wire but different lengths of 600mm, 500mm, 400mm, 300mm, and 200mm. 6. I recorded my results in a table and drew a graph of my results. Variables: * I will keep the thickness of the wire the same in every experiment. * In every experiment I will use a new bit of wire. * Only nichrome wire will be used. * My 1 litre jug of water will be kept at a constant temperature throughout the experiment. Theory: Ohms law. Formula for
How does the resistance of nichrome wire depend on its length?
How does the resistance of nichrome wire depend on its length? Procedure: In order to investigate how the resistance of nichrome wire depends on its length I will firstly have to know the formula for resistance (resistance = voltage ÷ current). So, in order to find the resistance of a length of nichrome wire, I need to put the wire in a circuit, and then measure the voltage across it and the current through it. I will do this for different lengths of nichrome, simultaneously recording my results. Nichrome Wire Length List of materials used: . Wire cutters 2. Copper Wires 3. Crocodile clips 4. Single Beaker (containing water) 5. Single Ammeter 6. Single Voltmeter 7. Cables 8. Two Pencils 9. Battery Variables: In my experiment they key variables are: Length (measured in mm), Voltage (measured in V) and Current (measured in ohms ?) Results Table: Nichrome Length Voltage Current Resistance 45cm .6 2.9 0.55 40cm .5 3.12 0.48 35cm .3 3.06 0.42 30cm .2 3.18 0.37 Unexpected Results: When I conducted the experiment very few unexpected results occurred, however I did notice that on the 35cm length of nichrome wire, the current somehow decreased, when naturally (as both the sequences before and afterwards suggest) it was supposed to increase. I firstly considered these results as an error however after a second (and later third) try I concluded
The conservation of energy is a principal matter in the study of energy.
Elizabeth Abbs TAG ESSAY May 17, 2002 Unit V-Energy and Entropy The conservation of energy is a principal matter in the study of energy. One must first understand the Conservation of Energy Law. This fundamental law of physics reads that energy can neither be created nor destroyed, but that energy must be transformed or transferred. In retrospect, previous forms of energy supply all types of energy until we have the correct form that we are able to use. Conserving energy in my mind is the wrong vocabulary. I believe we should be told to use energy wisely with caution and avoid using more than necessary. As Mr. Comosy uses as an example in class, don't cut your butter with a chain saw. When we say, "conserve energy," we are stating that the expensive processes of converting energy are meaningful. Entropy is the useless energy that has dispersed from conversion. Conservation of energy is the performing of "irreversible processes." For example, when you drop an egg on the ground it breaks, but dropping a broken egg does not make it whole. This established the flow of direction in entropy. Every time you do anything entropy increases. This leads to the second law of thermodynamics, which states that the entropy of the universe never decreases, but increases whenever possible. As the entropy increases in our universe, we must learn to make difficult decisions
An investigation into the factors affecting the resistance of a wire.
An investigation into the factors affecting the resistance of a wire. Introduction: This experiment aims to look at the resistance of a wire (Constantan swg32) within a circuit, and the factors affecting it. Involved in the experiment will be variables, which will be taken into account, as they will affect the range of results. Prediction: Resistance affects the flow of current within a wire by opposing the flow of electrons. These free-flowing electrons relate directly to the current and when there is resistance heat is produced because of the opposing electrons. A law was devised and was named after the German physicist, George Ohm who discovered the relationship in 1827. The law states that: The electric current flowing through a metallic conductor is directly proportional to the potential difference between its ends, as long as the temperature stays the same. As quoted on Encarta (Multimedia CD) The unit of resistance is the Ohm, the amount of resistance that limits the passage of one ampere when one volt is applied to it. To work out the resistance of a material is to use the formula: R=V/I R-Resistance V-Voltage I-Current From this equation we can derive that the greater the voltage the greater the resistance but more current there is the smaller the resistance. From the information gathered I am now able to predict the likely outcome of resistance
What affects the resistance of a piece of wire-Analysis
What affects the resistance of a piece of wire-Analysis As I was collecting my data I noticed a pattern straight away. As the length of wire increased the current getting through the resisting wire was decreasing- (The resistance was increasing.) When the wire was 10cm long the resistance was 0.4484 and when the wire was 20cm long the resistance was 0.8929. I am now sure that part of my prediction was correct-As the wire gets longer the resistance increases. The second part of my prediction-The resistance will be proportional to the length was not obvious from my results table so I drew two graphs-Length against amps and length against resistance. The first graph showed a curved line -meaning that the length of the wire is not proportional to the amps. But the second graph was a straight line showing that the length of the wire is proportional to the resistance so the second part of my prediction was also correct. My prediction is right and I have collected enough evidence to support it well Conclusion As the length of wire increases the resistance increases proportionally-This is because If the length of wire doubles then there are double the amount of atoms of that material for the electrons (carrying the electrical current) to collide with. Each time the electrons collide with the atoms of material they lose some of their energy so by the time they come out the other
Investigating The Resistance Of a Wire
Name: Jason Kench Science Teacher: Mrs Rees Tutor Group: 11F2 Science Subject: Physics Investigating The Resistance Of a Wire Planning The experiment is safe because the voltage from the multimeter will do no harm to you and you should not use it near water. Method I am investigating the resistance of a wire and testing what happens to the current if I use different lengths of wires. First I will use 10cm of wire and connect the multimeter up properly like the picture below also I would measure the wire exactly then I would place the crocodile clips on the ends of the wire and do that for every 10cms up to 200cms and record the resistance. I would use all of the same equipment again and do the experiment another 2 times to workout the average. Diagram I will make the experiment accurate by doing all of the below and do the same test three times to work out an average * 1.Using the same equipment * 2.Measure the wire. * 3.Connecting everything together properly * 4.Once set up do not disturb the experiment * 5.Make sure the multimeter is set to Ohms * 6.Using the setting on the multimeter If I wanted to get very precise results I could do the experiment another few times This is how I kept it a fair test: * If you change the length you must keep. * The wire the same width. * The same material. * The same temperature. Prediction I predict the longer the
The differences between the Enthalpy Changes of Combustion of the alcohols
The differences between the Enthalpy Changes of Combustion of the alcohols Hypothesis The differences between the Enthalpy Changes of Combustion of the alcohols when calculated using bond enthalpy values are as follows: Methanol ? Ethanol : 587kJ Ethanol ? Propan-1-ol : 617kJ Propan-1-ol ? Butan-1-ol : 617kJ I shall check to see the differences between the Measured Energy values in the Analysis section of the investigation. Analysis The differences between the average Measured Energy values for one mole of alcohol are as follows: Methanol ? Ethanol : 462kJ Ethanol ? Propan-1-ol : 606kJ Propan-1-ol ? Butan-1-ol : 233kJ I would say that the first two were fairly normal, and it is because the measured value for Butan-1-ol was so low, that the difference between that and Propan-1-ol was so low. This means that this hypothesis was not supported by this investigation. Analysis: I shall now show you the reactions that took place, the energy produced by one mole which is calculated using the bond energy values, and the average measured energy that would have been measured if one mole of the alcohol was burned. Methanol: Energy Produced Using Bond Energies: 687 kJ Measured Energy Value: 372 kJ Ethanol: Energy Produced Using Bond Energies: 1274 kJ Measured Energy Value: 822 kJ Propan-1ol: Energy Produced Using Bond Energies: 1891 kJ Measured Energy Value: 1431
