To help me plan my investigation i have completed a preliminary experiment in which i investigated the effect of the thickness of a wire on its resistance, using three constantan wires and one copper wire. From my experiment i have found out that as the length of the wire increases, the resistance of the wire increases at a similar rate, therefore, the rate of increase in the length of a wire is directly proportional to the increase in resistance. Lab report on measuring resistivity of a wire 11 constantan wire which is 4910-8 ohm m the small discrepancy is within a reasonable value of the printed value of the resistivity of constantan the resistivity of nichrome was found to be 1349810 -8 ohm m from the experiment. Resistance and resistivity 3 8 turn down the voltage and current, then remove one of the top nails from the play ¡doh°c and move it 2 cm closer to the other top nail adjust the voltage from the power supply until the current on the multimeter reads 20 ma.
The resistance of a wire is directly proportional to the length of the wire and inversely disconnect the wire and use a metre rule to make the length of wire between the clips 60cm 4 repeat step 2 in the experiment a metal called constantan was used and the. The diameter of 0-gauge copper wire is 8252 mm find the resistance of a 100-km length of such wire used for power transmission if the 0100-mm diameter tungsten filament in a light bulb is to have a resistance of. Resistance vs temperature experiment lab report physics report hooke's law physics lab report - effect of diameter on resistance - adnaan thakur resistance lab report introduction and theory where l ÷ length oi the cord (m) a ÷ cross-sectional area oi the wire (m 2 .
In lesson 7 of the electricity unit students investigate the relationship between a length of constantan wire and its resistance the lesson includes pre- and post-experiment tasks and example results are included in the powerpoint in case the experiment doesn’t go as planned. Length of wire (nichrome, manganin), micrometer, ohmmeter, metre stick procedure 1 note the resistance of the leads when the crocodile clips are connected together the leads plus the resistance of wire between the crocodile clips from the ohmmeter subtract the resistance of the leads to get the resistance r of the wire 4. Resistance of a conductor will decrease if its length and temperature remain constant method wire lengths (independent variable) of 20 cm, 40 cm, 60 cm and 80 cm were used. A no-frills guide to the practical where you deduce the resistivity of constantan wire i've even included a short introduction to the use of a micrometer screw gauge, which you may find useful.
Take a one metre length of constantan wire and connect it to a variable voltage power supply, voltmeter and ammeter vary the voltage applied to the wire and take a set of readings of current and voltage. You can work it out from the value of its resistivity which is 49 x 10^-8 ohmmeters stay relaxed: this is the resistance measure of a cube of constantan metal 1 x 1 x 1 meter on a side. Lab 03: resistance and resistivity introduction of each line is the resistance for that speciﬁc length of wire keep track by making a table of with your lab partners, prepare a data sheet and summary of this experiment you should include: ๏ a table with your data neatly presented.
How the length of a wire affects its resistance i will then repeat the experiment for wire lengths of 20cm, 40cm, 60cm, 80cm, 150cm, 200cm, 250cm and 300cm so i then can work out the resistance i will be using constantan wire starting of with 1m length and then decreasing it by 010m intervals down to 020m long. Wire resistance essay examples 13 total results wire conductivity testing of copper, iron, constantan and nichrome wires an overview of the experiment, resistance as a measurement for the difficulty of electron flow in conductor an overview of the experiment, the length of a constantan wire and the resistance 438 words 1 page. Resistivity experiment - ex-5534 overview this allows easy calculation of the resistance of the length of wire the resistance is plotted versus the length of the wire, and the slope of the resulting straight line is used to determine the resistivity.
Where r = radius of the wire and l = length of wire task of the experiment name the si unit of the specific resistance (resistivity) q12:why constantan or manganin wires are used for making the resistance coils in resistance box electrostatics class 12 and iitjee summary (pdf download). The experiment was the following: i had a power pack connected to an ammeter in series, a nichrome wire, a voltmeter in parallel to the wire in question and a variable resistor to keep the current constant. My son is doing a science experiment on how varying temperature and diameter of wire impacts the resistance we are assuming we can accomplish this by using different gauge wires, a home thermometer, and a basic digital multimeter (eg this one at amazon .
105 m of 34 swg constantan wire metre ruler 2 leads, one with a crocodile clip on one end 4 identify the sources of uncertainty in this experiment consider the accuracy similar wire is suitable but resistance per unit length should not be less than 10 ωm–1. Summary discussion: variation of resistance with length and area (5 minutes) student experiment: variation of resistance with length and area (30 minutes) this should lead to two predictions about the resistance of a wire: resistance increases with length.
The resistance value of a wire is dependent on three parameters its resistivity, cross-sectional area and length as an example, consider a wirewound resistor with a wire of nichrome with a resistivity of 110×10 −6 ωm. Experiment to measure the resistivity of a wire experiment to measure the resistivity of a wire equipment: 1m of constantan wire of diameter 028 and 045 mm, 1m of nichrome wire of diameter 028 and 045 mm. These results show that as the length of the wire increases, the resistance increases, as well furthermore, if you double the length of the wire, the resistance is roughly doubled for example, when the length of the wire is 20cm the resistance is 314 ohms when the length of the wire is 40cm the resistance is 618 ohms, which is roughly double.