Length and Resistance of a Wire Brief How is resistance of a wire affected by the length of a wire. How will I do it? I will have to measure out lengths of bare wire, all of the same type of metal, thickness, and keep them at the same temperature (to keep the experiment reliable and precise) I will use constants of voltage and variables of lengths of wire. I will also measure the current and voltage by using a voltmeter and ammeter for extra reliability. I must take in to account that temperature is very important as it can lose energy in the particles and I will have to measure the resistance of the circuit without the bare wire. To measure the resistance of each length of wire by using the equation: R = V / I Where R = resistance V = Pd. Across the conductor I = current This formula will give me a result in Ohms (?) From the circuit s I have made previously in school, I used that knowledge to produce the most efficient circuit for the experiment. Apparatus Ammeter - 0-5 Amperes Voltmeter - 0-5 Volts Wires - insulated Bare wire - 1.6mm, and lengths of 10cm 20cm 30cm 40cm Power supply - Ac, 0-5 volts Circuit (your diagram) My circuit is set up like this to make accurate results, the ammeter is in series so all of the amps, have to travel through the ammeter. (it would reduce the number of amps if it was in a parallel circuit because some of the amps have to travel along the other wire). The voltmeter is in parallel with the wire because the volts are equal across the circuit when in parallel. Things that I will measure Volts - voltmeter Amps - Ammeter Temperature - close watch on wire (keep voltage low) Resistance - Formula (R=V/I) Prediction I think that the longer the wire, the more resistance, as preliminary
I also decided to use a wooden block to keep hold of the wire, because
and displayed in SWG. I will be using copper wire of 14, 18, 22, 26
longer it will take electrons to get to the end of the wire. This is
equation V = IR. V - volts, I - current and R - resistance. I plotted
have to be across the wire and not just anywhere in the circuit so it
Step 2: I will attach a piece of thin wire to a meter long ruler.
π(d/2 x10 ³)² where d is the diameter of the wire in mm. I will plot a
The Resistance of a Wire Investigation Aim: To investigate how changing the length of a wire affects the resistance. Prediction: I predict that the longer the piece of wire, the greater the resistance will be. This is because the current is resisted by the atoms in the wire. In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater. The shorter piece of wire will have less resistance because their will be less particles causing less collision.
Investigating the Resistance of a Wire The aim of this investigation is to see how the length of a wire affects its resistance. Background knowledge To make current flow through a conductor, there must be a potential difference (voltage) across it. As the current continues to flow there are certain factors which increase the resistance; Length of wire: as the length increases there will be a higher percentage of fixed atoms, therefore the electrons carrying the charge will collide more frequently, increasing the resistance Surface Area of wire- As you increase the surface area of a wire the resistance will decrease because the electrons will be able to travel by many different routes making the conduction easier. Type of conductor- If the wire is a good conductor of electricity then the resistance will be less because the electrons are able to flow through the wire avoiding as many collisions with the positive protons.
The resistance of a length of wire is calculated by measuring the current present in the circuit (in series) and the voltage across the wire (in parallel). These measurements are then applied to this formula:
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has.
thickness 34 mm and length 30 cm at the same point on the ends of the
The Relationship Between Length, Width and Resistance of a Wire Aim: To investigate how the length and width of a wire affects the resistance of the wires. What is the resistance to a s Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. gold has less resistance to the sand. For example, gold has more free electrons than. iron and, as a result, it is a better conductor.
Resistance of a Wire Introduction Resistance is the opposition a material offers to the flow of electricity. The electrical resistance of an object is not only by what material it's made of, but also by its shape. A very thin copper wire has more resistance than a thick copper wire of the same length. A very long copper wire has more resistance than a short one of the same thickness.
of the atoms, so if there are more or larger atoms then there must be