Resistance in Wires What is the purpose of a resistance wire? A resistance wire converts electrical energy into heat energy, and this is also its soul purpose. An example of a resistance wire is in a light bulb. The electrical energy is converted into heat, which then heats up the filament in the light bulb. This in turn creates the light needed. Resistance is a force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. e.g. The filament across an electric light bulb Predictions: The diameter of the wire will have an affect on the resistance as Ohms law states that ‘if the cross section of the wire is uniform then the resistance is proportional to the length and inversely proportional to the area of the cross section’. This is because the electrons have to squeeze together more to pass through a thin wire than they do to pass through a thick wire. [IMAGE] Length of the wire - The length of the wire will make a difference. This is because when you have a long wire, the electrons have to squeeze together for longer to be able to pass through the wire than they do in order to be able to pass through a short wire. I predict that the longer the wire, the greater the resistance. I also predict that if I had a 20 cm wire and a 40 cm wire, the 40 cm wire would have a resistance twice that of the 20 cm wire. Material of the wire - The type of material will make a difference because the electrons have to pass through the material. These electrons find it easier to pass through some materials than others. In this experiment I am going to use manganin, constanton and nichrome wire. I predict that the nichrome wire will have a higher resistance than the other wires.
I also decided to use a wooden block to keep hold of the wire, because
longer it will take electrons to get to the end of the wire. This is
have to be across the wire and not just anywhere in the circuit so it
...loys give I-V graphs, which are a straight line through the origin, so long as their resistance is constant. Current (I) is directly proportional to Voltage (V) for example, I V. Doubling V doubles I etc. Such conductors obey Ohm's Law, stated as follows:
there will be. So if the length of the wire were to double, so would
V is voltage in volts and I is current in amperes. L:- is the length
50cm for us. The current will be kept on the same level using the same
Investigating Resistance of a Wire The aim of this experiment is to find out how the resistance changes as the length of wire changes within the circuit changes. At the end of this investigation I will come to one of five possible conclusions which are: -the resistance increases as the length of wire increases, or -the resistance decreases as the length of wire increases, or -the resistance is constant as the length of wire changes, or -the resistance increases as the length of wire decreases, or -the resistance decreases as the length of wire decreases. Scientific background: Electricity is simply the flow of electrons, a cell produces electricity. Lots of cells joined together form a battery. A battery pushes electrons round a circuit from the negative terminal to the positive terminal.
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
In order to understand what Ohms Law is all about you need to understand electricity and what makes Voltage, Current and Resistance in a circuit.
The Length of a Wire and Its Effect on Resistance Introduction: In an electrical circuit, the current (flow rate of charge) depends on the battery voltage that causes the charge to flow through the circuit and the components in the circuit. A circuit consists of a bulb, a battery and a resistor. The bulb is like a resistor, it slows down the electrons and the battery pushes the electrons and gives them energy. A component is a resistor, it slows down the flow of electrons. The bulb acts as a resistor because inside the bulb is a thin filament wire, and so not many electrons can flow through this then slows them down.
I tested all the wires at 3 volts, first I set up the equipment as
of the atoms, so if there are more or larger atoms then there must be
they began to disjoin. The cable now in a "v" shape with the weight of