A rheostat is a device which is able to offer a variable resistance. Incandescent means to emit light as a result of being heated. Variables There are different variables that can be changed in this experiment; these are the independent variable.
Results Below is a table of my results Table 3. However, due to my line of enquiry, I will only change the length of the wire. I think that the range of my results was sufficient enough for me to draw a valid conclusion about how the length of the wire affected the resistance.
This was because I could plot a graph and show the general trend. I think my method could have been improved to produce results that were even more consistent. This is to fit a longer length of tungsten within a small space to increase the resistance. Discuss this with your class and teacher.
Why do you think this is? The filament is made from tungsten wire. Overall, I think my method was sufficient to obtain reliable results. Do you remember looking at energy transfers in a system in Gr 8? Describe the energy transfer taking place.
By changing the length, the resistance has changed. Resistors are used to provide useful energy transfers. The filament is tightly coiled. Note that, while the circuit shown above includes a separate voltmeter and ammeter, you could also replace the ammeter with a shunt resistor with a known resistance and measure the voltage across it, as in the circuits shown at the bottom of the page linked above.
How can we measure the resistance? Therefore there is less current as current is the rate of flow of charge. How were your results different from your predictions?
Use the circuit tester to determine whether each object is a conductor or an insulator. Investigating the resistance of wires Class practical A simple investigation of the factors affecting the resistance of a wire.
Be sure that positive lead of the voltmeter touches the beginning of the wire.
Table showing the ammeter readings for each type of conducting material tested Conducting material. When the resistance in a circuit increases, the current decreases. When the electrons move through the filament they experience high resistance. The graphite from a pencil conducts, but has a higher resistance than the metals.
However, at the low voltages used in this activity, tap water might not conduct electricity. We can say that resistance and current in an electric circuit areinversely proportional, because as the one increases, the other decreases, and vice versa.
This is an element with high resistance. As an extension, you could have the learners do a small project on how the cross-sectional area of the material affects resistance or how temperature affects resistance.
All About Circuits vol. Background — Liquids and Solutions It is the presence of ions in a solution that enables it to conduct electricity. Rheostats are another form of resistor which are commonly used.
Because resistance is the property of a material that resists electron flow, it makes sense that the more material you have longer length the more resistance you will have. When using a power supply, high currents will cause the safety cut-out on the power packs to automatically switch it off. Plot wire length in meters on the x-axis and resistance in ohms on the y-axis.
Describe the energy transfer which takes place in an LED, based on the given Sankey diagram. Draw a circuit diagram of the setup. If you look inside you will see a large metal coil. Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction.
Electrical energy is transferred to heat and light.Selection of reels of different wires (e.g. copper, Eureka, iron) of same gauge (e.g. 34 SWG). Procedure a Connect up a series circuit of two cells, and the ammeter, with a 30 cm length of one of the wires closing a gap between two crocodile clips.
The Resistance R is the resistance wire (constantan nichrorome) that you will be trying to calculate. Set the power supply to 1V. This limits the current through the wire in order to reduce any heating effect which may change the resistivity. Wire Resistance Essay Examples.
13 total results. Wire Conductivity Testing of Copper, Iron, Constantan and Nichrome Wires An Overview of the Experiment, Resistance of Different Material in the Form of Wires and Their Conducting Capability in Different Shapes.
words. 2 pages. Apparatus and materials Ammeter, 0 t. Home; About us; Contacts; News. Practical Physics» Electric circuits and fields» Ohm's law and resistance» Measuring resistance with a voltmeter and an Repeat the experiment and calculate its resistance.
Each member of the class could tackle one component and present their results to the. Preet kaur: Physics report- Resistance MYP5 IB. Uploaded by.
The next time I do a physics experiment regarding resistance, I would want to conduct surveys of all the factors affecting the resistance and compare to find out the one most affective. For deeper understanding I could have taken more wires with different lengths to conduct.
Summary Students build their own simple conductivity tester and explore whether given solid materials and solutions of liquids are good conductors of electricity. have students use the Will It Conduct?
Worksheet to record their observations and answer questions. Post-Activity Assessment Have students conduct research on the use of.Download