Ohm's Law. Topics Covered in Chapter 3. The Current I = V/R. The Voltage V = IR. The Resistance R = V/I. Practical Units. Multiple and . PDF | On Feb 19, , Joshua Main-Smith and others published Ohm's Law. PDF | A short biographical sketch of Ohm and a discussion of his experimental and theoretical work on electrical conduction in metals is given.
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What Ohm's Law is and how to use it to understand electricity. A simple Ohm starts by describing a unit of resistance that is defined by current and voltage. In Georg Simon Ohm discovered that for metallic conductors there Ohm's Law states that the current flowing in an electric circuit is directly proportional to. Resistors and Ohms Law. A wire is an ideal conductor with no resistance (at least for our discussion). In contrast, a resis- tor is a component that purposefully.
If necessary, you may use additional sheets of paper for the flowchart and attach them to this sheet before submission. The charge can either move along the field if the charge is positive or opposite the field if the charge is negative. The movement of charges is referred to as electric current , or simply, current.
For certain materials, the relationship between voltage and current is linear, i. Those that do are called ohmic materials, and those that do not are called non-ohmic materials.
You will also learn how to measure the actual resistance of an object, and you will be comparing this measured value with the values calculated from the physical characteristics of the material. For certain materials, the resistance is independent of the voltage and the current.
In these cases, the voltage across and the current through the material are directly propor- tional to each other.
In some cases, the resistance is dependent on the voltage or the current. Such materials are called non-ohmic and are characterized by a nonlinear relationship between voltage and current.
You've reached the end of this preview. Any variation in the slope values from DataStudio and Excel indicates slight differences in the way each software processes the data and calculates the slope.
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It is not easy to say which software is correct hence the ohmmeter reading of the resistance was considered as the correct value of R1. Thus, percentage error analysis was done with the ohmmeter reading of R1 as the reference.
Comment [ag3]: We have purposely not included an error for the excel data because we feel that the R2 value quoted by excel is not exactly what we understand to be the statistical R2 value. So till we understand it, we would like to not use it.
131 s11 Sample Lab Ohms Law v1 PDF
Here I have used a generic form for percentage error. The more specific formula is in your manual.
Either may be used. DataStudio Analysis : Excel Analysis : Analysis Question 1: Do these Readings fall within the experimental error margin from the instrumental uncertainty? Since the ohmmeter reading was selected as the correct reading of the resistance, the uncertainty from the ohmmeter 0. The DataStudio slope value and the Excel Slope value fall within 0.
But the slope values still fall well outside the 0. This could either mean that our method of verifying ohms law and the instruments we used did not give us correct results.
Voltage, Current, Resistance, and Ohm's Law
It could also mean that we have selected an error margin that is too precise to account for expected experimental errors. If we consider the experimental error margin from the DataStudio analysis 0.
This error margin accounts for experimental variations due to fluctuations while taking readings so this may be a more reasonable experimental error margin to consider for this experiment. Thus, considering a reasonable error margin, we have experimentally deduced that V is indeed proportional to I where the proportionality constant is the constant R in the circuit.
This was concluded because the plot of V vs.
I yielded a straight line with slope that equaled the resistance in the circuit within an acceptable margin of error. Comment [ag5]: Answer analysis questions where they are found in the lab manual PART 2 Calculations: The predicted values for part 2 were calculated using the formula for Ohms Law, as deduced from part 1: Comment [ag6]: Give the formula used and show sample calculations V IR V I R Where R was measured using the ohmmeter and voltage values from part 1 were considered for this calculation.
Sample Calculation: V 0. Voltage vs.Citation This page can be cited as Engineering ToolBox, With each collision, though, the electron is deflected in a random direction with a velocity that is much larger than the velocity gained by the electric field. Each tank has the exact same amount of water, but the hose on one tank is narrower than the hose on the other. We measure the same amount of pressure at the end of either hose, but when the water begins to flow, the flow rate of the water in the tank with the narrower hose will be less than the flow rate of the water in the tank with the wider hose.
A ohm resistor and an unknown resistor are con- Building technology 2nd ed.
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