A demonstration of a circuit using a variable resistance (rheostat) will clearly show the effect of resistance on current flow rheostats work better on higher voltages, say 12 volts, with a 12 volt lamp. Best answer: first, you did an experiment in physics, not done one we did a physics experiment is the easy way to write it the resistance of a wire is quoted per unit length, like 01 ohms per meter or 2 ohms per 100 meters putting twice the length of the same kind of wire into a circuit puts twice the. Skin effect is the tendency of an alternating electric current (ac) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor the electric current flows mainly at the skin of the conductor, between the outer surface and a level called the skin depth.
Resistance = resistivity × length / area therefore, if you stretch a (copper) wire its cross sectional area a will decrease and length l will increase, both causing an increase in resistance r resistivity is a constant for copper. Two factors that affect the resistance of wire are, the length of the conductor and the circular mill area of the conductor the third factor is the metallic element from whic h the conductor. There is a specific formula you can use to calculate the resistance of copper wire based on its area and length to save time, a calculator comes in handy to crunch the numbers the area of electrical wire is measured in a unit called circular mils'. The resistance of a typical conducting wire is low when temperature is low and high when temperature is high the increase in resistance alongside temperature is due to an increase in energy of the wire atoms, which cause them to vibrate more and impede the path of the electrons flowing through a.
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. Preliminary work: find out which wire is the best insulator main experiment: how does the length of wire affect its resistance ohms law: electric circuits are designed to transfer just sufficient energy to operate the components in the circuit. This first report in physics will show the investigation of how the length of a wire affects its resistance for starters i will go through the main definitions, to get a better knowledge of what is going to happen. Essay writing guide learn the art of brilliant essay writing with help from our teachers learn more. Best answer: the resistance of a wire depends on the area of the wire (sort of like the flow of water depends on the area of the pipe) if the area is larger, there is less resistance the area of a circle is proportional to the square of the diameter, so if you double the diameter, you make the area four.
- investigating the resistance of wire aim we plan to discover whether the length of a piece of wire affects the overall resistance, of a metre long piece of wire prediction ----------- i predict that if i increase the wire length the resistance will be greater because the electrons have a greater distance and longer time to travel giving a. The resistance is proportional to the length of the wire divided by its cross-sectional area p is the resistivity of the material in question and varies greatly since area (assuming a circular. Resistance of a wire task the resistance of a wire depends on factors, one of which is the length of the constanton wire, i will be investigating this into more detail.
In my physics coursework i am going to investigate the effect of the length of a wire on its resistance resistance is the measure of how easy it is for current to flow through a wire current is the rate of flow of charge through a conductor, and it is measured in amps using an ammeter. The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made experimentally, the dependence upon these properties is a straightforward one for a wide range of conditions, and the resistance. Complete the following statements to explain the effect of applying a pd across different materials the charge only has to pass through a short length of resistance wire before leaving, so the resistance in the circuit is relatively low the resistance of a piece of wire r is directly proportional to its length l, provided its.
Its length – the longer the wire, the greater its resistance its cross-sectional area a – the greater the area, the less its resistance the resistivity of the material r – the greater the resistivity, the greater its resistance. For each wire plot a graph of resistance (y-axis) against length the resistance of a wire is given by the equation: r = ρ x l/a where r is resistance, ρ (pronounced 'rho') is the resistivity of the wire, l is length and a is its cross-sectional area. The resistance of a resistor is given by the formula `r = rhol/a ` where `rho` is the resistivity of the material the resistor is made of, l is the length of the resistor and a is the cross.
The resistance increased with the length of wire’s increased length because the power pack has a negative pole and a positive pole so once the power pack is put into the circuit the electrons within the metal wire are instantly attracted towards the positive pole of the power pack so are all moving the same way. An experiment on the effects of an increase in the length of a nichrome wire on its resistance pages 5 words 1,711 view full essay more essays like this: not sure what i'd do without @kibin - alfredo alvarez, student @ miami university exactly what i needed - jenna kraig, student @ ucla. Resistance is directly proportional to the length of the wire, and inversely proportional to the cross sectional area of the wire r = pl/a, where r is resistance, p is the material's resistance in ohms, l is the length, and a is the cross sectional area in m^2.
As shown by the equation, knowing the length, cross-sectional area and the material that a wire is made of (and thus, its resistivity) allows one to determine the resistance of the wire investigate resistors are one of the more common components in electrical circuits. Investigating the effect of length on resistance is common but some students may wish to investigate the effect of the thickness of wire in either case, different wires should be made of the same material. Best answer: most conductors have higher resistance at higher temperatures the resistivity of a tungsten light bulb filament is about 100 times greater when lit than it is at room temperature however, its cross section increases as it expands, so the total resistance increases by a smaller amount. Think about the fact that electons have got further to travel, because the length is increasing so it's harder for the electrons to pass through (there's more chance of them being blocked or whatever) = higher resistance.