What do you know about the topic from personal experience? In the investigation, I hope to use a more scientific method of determining why and how this relationship works. What variables may affect the phenomenon you are investigating? The resistance of the insulated wire used may affect the results slightly.
Collect all equipment and make sure the surface is clean and not wet Wrap the nichrome wire around the test-tube to form a coil Use the multimeter to measure the resistance of the light bulb Connect the power pack to the power point but do not switch it on Set up a series circuit with the ammeter, switch, nichrome wire resistor Figure 1light Sorry, but full essay samples are available only for registered users Choose a Membership Plan bulb Figure 2 connected in a series and connect the voltmeter in parallel with the nichrome wire or light bulb resistor.
Use two alligator clips as a switch To begin, turn the power source to the lowest setting. Switch on the power and record the reading on the voltmeter and the ammeter Switch the circuit off and allow for the nichrome wire or light bulb to cool Increase the power supply setting by one and record the result from the ammeter and voltmeter Continue to increase the power supply in steps of one until power supply is at its highest Do this until four tables have been collected Patrick Doan2 5.
Many observations were made in the conducting of this experiment. When the power source was switched on the light bulb lighted up. The readings on the ammeter and the voltmeter went up as the power input went up.
The resistance also becomes greater as the voltage and current is higher. On a low power setting the light bulb was dimmer than when it was on a high power setting.
The same was for the nichrome wire; it was much cooler on a low power setting than on a higher power setting. In conducting this experiment we also need to take into account of errors in the experiment. One of the main errors is the parallax error. The error was a problem because it meant that reading the position of the needle against a scale in the voltmeter or ammeter and not clearly seeing the positioning for fine measurements.
The resistance of a conductor increases as its temperature increases. With the light bulb, as the power input became higher the heat in the light bulb also rose thus creating greater resistance. This shows that resistance is affected by temperature.
Light bulbs have a filament called tungsten. Tungsten is such a good conductor that its resistance depends on its temperature. In general, power dissipated by the bulb relates to the brightness of the bulb; the higher the power, the brighter the light bulb. The nichrome wire is the other resistor used in this experiment.
Nichrome is also a very good resistor. When the power input went up the nichrome started to heat up. It was required for the nichrome to cool down after extended periods of time to get more accurate results.
Like the light bulb the resistance of the nichrome wire increases as the temperature increases. A way to overcome the parallax error was to find a voltmeter or an ammeter with a scale printed above a narrow strip of mirror.
Position your eye so that the needle conceals itself from its own reflection. Another error that could have occurred is using the alligator clips as a switch. Turning the circuit on and off with the switch could have produced variable results. It is recommended that when turning on the circuit hold the switch in place until the readings have been recorded.
Another problem was the multimeter. This shows that human carefulness was a key factor for producing the results. Patrick Doan5 In the graphs, after four trials with the light bulb the line that is created is non-ohmic.
The nichrome wire however has a line that is more ohmic. The relationship for current and voltage is that if they both increase so does the resistance.
Thus applied voltage is directly proportional to the current that flows i.
The light bulb is a non-ohmic resistor and the nichrome wire is an ohmic resistor.Whilst doing this experiment, we will need the following apparatus; an iron nail, a power pack, some wire to wrap around the nail, leads, crocodile clips, a variable resistor, and some paperclips.
The variables of this experiment, to change the strength of the magnet we could change the iron core; you can get soft iron and normal iron. Resistance Objectives Build a Wheatstone Bridge circuit to measure the resistance of short lengths of wire. You will investigate the dependence of the resistivity on wire length, radius and material type.
Investigating Resistance Essay. B Pages:3 Words This is just a sample. To get a unique essay Hire Writer.
iridis-photo-restoration.com RESULTS Results below are first set recorded Length Of Wire Current Voltage Resistance CMSecond set will now be recorded before finding the eventual average Results below are Second set recorded Length of wire . The diameter of the wire is also going to stay the same to ensure a fair investigation.
For our investigation we're investigating the resistance of a wire with a surge of current.
We're going to connect the wire to the power source but with that we connect an ammeter and voltmeter to be accurate. Class practical Investigating the changing resistance of a wire as it heats up. Apparatus and materials Power supply, low voltage, DC e.g. 12 V, 4 A at least Rheostat (10 - 20 ohms) rated at 5 A at least Aluminium container (e.g.
The resistance of a length of wire is. This occurs across the length of a wire and the electricity is conductedV/0. which is indicated in this investigation the wire Data Processing and Presentation: Sample Calculation R= V/I When current is 0.