Planning an investigation
Obtaining Evidence
For my investigation I wired several different wire all with different properties and width of wire to collect results for different resistance in wires. The three different types of wire I used were Constantan 28 wire Constantane32 and copper wire 28. Each wire was subjected to 2 volts at various different lengths of the wire. I measured the voltage and amperes every 10-center meter down a meter long length of wire. 28 Constantan wires are o.40mm in diameter and Constantan 32 was 0.28mm in diameter, which is 1/4 smaller then 28 I got this information from a secondary source Philip Harris Catalog.
I turn I wired up each wire as 100cm subjected it to two volts then measured the amperes and voltage. The results I've obtained show slight internal resistance as the current increases but this difference we assume is negligible we can safely ignore this factor.
Once the results were obtained I found out the resistance of each wire via voltage divided by amperes.
The safety aspect of the investigation I keep the voltage to a minimum of two amps and when of the shorter lengths of wire keep it live for shortest time possible to avoid the wire heating up. The accuracy of human error and visual gauges is limited the voltage is limited to 0.02 were the ampere meter is limited to 0.2.
Obtaining Evidence
For my investigation I wired several different wire all with different properties and width of wire to collect results for different resistance in wires. The three different types of wire I used were Constantan 28 wire Constantane32 and copper wire 28. Each wire was subjected to 2 volts at various different lengths of the wire. I measured the voltage and amperes every 10-center meter down a meter long length of wire. 28 Constantan wires are o.40mm in diameter and Constantan 32 was 0.28mm in diameter, which is 1/4 smaller then 28 I got this information from a secondary source Philip Harris Catalog.
I turn I wired up each wire as 100cm subjected it to two volts then measured the amperes and voltage. The results I've obtained show slight internal resistance as the current increases but this difference we assume is negligible we can safely ignore this factor.
Once the results were obtained I found out the resistance of each wire via voltage divided by amperes.
The safety aspect of the investigation I keep the voltage to a minimum of two amps and when of the shorter lengths of wire keep it live for shortest time possible to avoid the wire heating up. The accuracy of human error and visual gauges is limited the voltage is limited to 0.02 were the ampere meter is limited to 0.2.
