Set the power pack on as low a voltage as possible in order to prevent a high current passing through the circuit 2 place the 10 cm of nichrome between the two crocodile clips to complete the circuit. Aim: the aim of this investigation is to determine how the length of a wire can affect its resistance scientific knowledge: resistance means the 'opposition to the flow of current' electric current is defined as the movement of free electrons therefore resistance is the opposition to the motion of free electrons. Changing the voltage of the circuit would affect the rate of reaction because as ohm's law states, as charged particles try to make their way round a circuit they encounter resistance to their flow which means that they collide with atoms in the conductor.
The advantage of linear rotating current controller solution is that fundamental harmonic components of voltage and current signals appear constant to the current regulator therefore the sinusoidal line voltage is seen by a current regulator as a constant quantity. To investigate how the voltage of the electric current would affect the rate at which a metal is electroplated hypothesis if the voltage of the current supplied for electroplating is increased, then the mass of the copper metal deposited on the paper clip would also increase. If the current is changed then this will have an affect on the resistance so with the help of the formulae i=q/t and r=v/i, i now know that if i increase the charge flow, the current increases and the resistance decreases. Essay about the effect of voltage on a current through a filament lamp - the effect of voltage on a current through a filament lamp equipment: power supply.
For me to investigate this i must first use my scientific knowledge to understand exactly how and why the length of a wire should affect the current flowing through it from this i will then be able to devise a suitable test. There are three different factors, which may affect the resistance of resistance putty these three factors are temperature, length and thickness to investigate the temperature it is very hard to make the temperature go up/down in certain intervals, it's also hard to connect the connecting wires to the putty itself. In my experiment i have decided to change the length of the wire this will be my independent variable prediction for preliminary work i think that if i make my wire longer the resistance will increase. The current is the flow of electrons the current is dependent on the amount of voltage, which is applied voltage is the push given to the current the current has to go through a circuit, which contains resistance so if you increase.
In this investigation, i will set up a simple circuit to be able to read the voltage and current when the length of wire changes, so i then can work out the resistance i will be using constantan wire starting of with 1m length and then decreasing it by 010m intervals down to 020m long. As the title suggests, what i intend to do in this experiment is find out what factors will affect the resistance of a wire for example, if the length of a wire is shortened, then will the resistance increase or decrease. Physics investigation resistance of wire essay while the free essays can give you inspiration for writing, they cannot be used 'as is' because they will not meet your assignment's requirements. The current flowing through a metal wire is proportional to the potential difference across it (providing the temperature remains constant) ohms law is a simple formula, which can be used to calculate resistance, potential difference (voltage) or current in an electrical circuit.
The current is the flow of electrons the current is dependent on the amount of voltage, which is applied voltage is the push given to the current the current has to go through a circuit, which contains resistance so if you increase that push you also increase the flow of the current. As current is the amount of charge passing one point in a second, and the more photons hitting the solar cell, the more electrons that are able to flow, which increases the current due to this as the angle increases this causes an increase in current, as current is directly proportional to voltage when resistance is constant, the voltage would. The charge is calculated by the current (flow of charge) multiplied by time and therefore increasing current should increase potential difference in direct proportion both half-cell reactions are essentially equilibria and so a change in the concentration of ions in solution will effect potential difference. Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change similarly, increasing the resistance of the circuit will lower the current flow if the voltage is not changed.
The current increase was proportional to the voltage increase ie the current doubled when the voltage doubled eg 1v = 045a, 2v = 090a 1v x 2 = 2v 045a x 2 = 090a this shows ohm's law applied to this investigation. The circuit itself can resist the flow of particles if the wires in the circuit are very thin and very long for example, a filament in an electric light bulb is extremely thin and incredibly long due to the resistance, energy is given out as heat and light. Here are some main factors which may affect the resistance of a wire length thickness temperature voltage resistance material resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push. 4) i will record the voltage and the current, and to calculate the resistance of the wire i will do the calculation voltage divided by current this will give me the resistance of the wire in ohms 5) i will repeat the original test for 100cm a further two times, giving me a set of three results.