My sister needs to know how to carry out this investigation for part of her exams.... any help? It's a physics experiment but needs to be simple
2007-03-12 12:18:57 · 9 answers · asked by Shirley R 1 in Science & Mathematics ➔ Physics
The resistance is directly proportional to the length of the wire. So if you double the length, you'll double the resistance.
2007-03-12 12:23:57 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Well, the relationship is directly proportional: the longer the wire, the stronger its resistance.
However, if you actually want an experiment to carry out, do the following:
Equipment needed: voltmeter, ammeter, length of (metallic conductor) wire, crocodile clips, power source, a few cables.
You set up a circuit, the ammeter in series, the voltmeter in parallel across the wire, and (using the croc clips) connect the cables to both ends of the wire, turning on the power and measuring the voltage and current (you must keep one of these constant). Then, move one croc clip down towards the other end, measuring the voltage and current every few cms, until you get right down to the end. The resistance (that will vary depending on the length of the wire) will be the voltage divided by the current at each stage.
2007-03-12 15:08:25 · answer #2 · answered by canislupus 3 · 0⤊ 0⤋
Resistance is directly proportional to the length..eg
If a 10cm wire has a resistance of 20 ohms then a 20cm wire will have a resistance of 40 ohms.etc.
The simplest way is using an ohmeter ..(saves using an ammeter and a voltmeter).
Attach one end of the ohmeter to one end of the wire(1m long) and move the other end every 10 cm taking readings.
Plot the graph of resistance against length..you should get a straight line graph.
2007-03-12 15:58:00 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Resistance of a metallic conductor, such as copper, is directly proportional to its length. That means that the longer is the conductor, the higher its resistance will be. As an example, if you take two pieces of conductors with the same diameter, one being twice as long as the other, the longer conductor will have twice the resistance of that of the shorter one. I hope this was helpful.
2007-03-12 12:33:13 · answer #4 · answered by East Ender 2 · 0⤊ 0⤋
there is obviously a courting between the lenght and resistance of a conductor,From a protection attitude on your test you do no longer say what your potential source would be.From the define you provide it appears like a low voltage,probably not extra tha 12 v which would be used, wherein case there is no risk from electric powered ask your self.The measurements will use Ohms regulation to be certain the better resistance of an prolonged cord,
2016-11-24 23:17:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
The equation for resistance is:
R=(pl)/a
where R is resistance, p is the resistivity constant of the metal, l is the length of the metal and a is the cross-sectional area the current is passing through. Hence, resistance is directly proportional to length.
2007-03-12 23:45:13 · answer #6 · answered by Andrea C 1 · 0⤊ 0⤋
easy.
thin wire cannot carry a current, it heats up, and loses power over a certain distance...
thick wire can carry lots of current... and doesnt heat up due to resistance.. (the resistance is a measurement of the cables inability to transmit power from the supply (battery) ..to the consumer unit.. (a bulb)
one thin (single) wire will melt.. like a fuse... multiply the wire cores... and it will carry more power... its how fuses work.
2007-03-12 12:25:39 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Its on the tip of my tounge. go on ask me another
2007-03-12 12:23:25 · answer #8 · answered by all_roads_lead_home 2 · 0⤊ 0⤋
oh damn I did this today! man I forget things quickly. sorry.
2007-03-12 12:36:22 · answer #9 · answered by Anonymous · 0⤊ 0⤋