An investigation into what affects the resistance of wire
An investigation into what affects the resistance of wire Aim: Aim of this investigation is to find out what affects the resistance of a wire, e.g. length of the wire, area of the cross section and temperature. But we are specially looking at the length of the wire. How the length of the wire affects the resistance if a wire? Prediction: I predict that if the length of the wire increases then the resistance will increase too in proportion to the length Hypothesis: My hypothesis is if I increase the length of the wire, the resistance will be greater because as the length of the wire increase there will be more space and more collision and if there is shorter space, there will be less collision as is fewer spaces there will be few free electrons whereas in a larger area there will be more free moving electrons, this will increase the number of successful collision. The current flowing through the wire is proportional to the potential difference across it, providing the temperature stays the same. I expect my out come of my result's graph would look like this. As I have said before, resistance of the wire increases in proportion to increase in length. I am going to carry out an investigation to find out does the length really affects the resistance. I will be checking the resistance of the wire with different length. Resistance (?) Length of wire (cm) Scientific
How does changing the length affect the resistance of a wire?
How does changing the length affect the resistance of a wire? Energy is transferred in a circuit by a flow of charge; this is an electric current. Electric current is measured in amperes (usually shortened to amps or A) using an ammeter. An ammeter is connected in series in the circuit e.g. The current us always the same in all parts of a series circuit. The battery (or power supply) provides energy. The higher its voltage the more energy it supplies. The voltage across a component is a measure of the work done, or energy transferred to other forms, when taking the current through a component. Voltage is measured in volts (V) using a voltmeter. Voltmeters are always connected in parallel across a component. A voltmeter in a circuit may look like this: In series circuits the supply voltage is shared between the components in the circuit. Resistance is the opposition of a circuit component to the flow of charge. We can calculate this using the formula: Resistance (in ohms) = voltage across the resistor (in V) Current through the resistor (in A) So we can therefore write R=V/I Resistance can be measured using this circuit: The ammeter measures the current in the resistor. Ammeters have a very low resistance so that they do not greatly increase the resistance of a circuit. The voltmeter measures the voltage across the resistor. Voltmeters have a very high resistance
The Study Of the Motion Of A Falling Cake Case With Reference To Terminal Velocity
The Study Of the Motion Of A Falling Cake Case With Reference To Terminal Velocity Introduction: I am going to study and analyse the motion of a falling cake case with reference to Terminal Velocity. What is Terminal Velocity? Terminal Velocity is the maximum speed attained by a falling object. And to find the terminal velocity of my falling cake cases I will use the equation Speed = Distance Time Method I have devised a fair test to study the motion of a falling cake case. I will be using the following equipment to carry out my experiment. - 2 x 1 metre rulers - Stopwatch - 5 cake cases - Stand - Clamp Clamp 20cm Eye level Stand 180cm Bench Top Will I have a fair Test? To ensure that I am carrying out a fair test I have taken some steps to do so. Firstly I made sure that all the cake cases are all the same size and shape I will vary two factors in my experiment - Drop height - Weight of the cake case Every other factor in my experiment will remain the same (constant) How will I collect my Data Drop Height Time 1 (In sec) Time 2 (In sec) Time 3 (In sec) Average Time (In sec) Terminal Velocity (m/s) 80 cm 50 cm 20 cm 90 cm 60 cm 30 cm I will enter all my readings into a number of tables such as the one above. After collecting all of my data, I will set it out on a graph putting the drop height against the time. I have
Resistance - My aim in this piece of investigative work is to take one aspect of a material and see how varying it affects the resistance of the piece of material.
PLAN: My aim in this piece of investigative work is to take one aspect of a material and see how varying it affects the resistance of the piece of material. Theory: A current is the flow of charge (electrons) around a circuit. The potential difference is the push that makes the electrons go round the circuit. Resistance tries to stop the electrons going around the circuit. There are many free electrons in a piece of metal. There are free electrons because the electrons in the outer shells become free or delocalised due to the low attraction between it and the nucleus. When a charge is applied to the piece of metal the free electrons try to get to the positive side of the metal because they are already negatively charged and opposites attract. When the electrons try to travel through, the atoms of the metal get in the way. As the electrons head down they bounce into lots of atoms. This is resistance. Variables: There are overall 4 things I could vary which would affect the amount of resistance. They are.... . Diameter: Is very hard to measure. 2. Temperature: It is very hard to keep the temperature constant in this experiment. It would be hard to get continuous results when varying the temperature because not only is it hard to change the temperature it is very hard to measure. 3. Material: This wouldn't be very good to vary because there aren't that many materials
Investigating how the length of a wire affects the resistance of a wire.
An Investigation Studying the Effect of Length on the Resistance of a Wire Aim: Investigating how the length of a wire affects the resistance of a wire Background Theory: During the 1820`s. the German Physicist; George Ohm investigated the resistance of different metals. The unit we now use for resistance is the ohm, in honor of him. Ohm showed that doubling the voltage doubles the current. Trebles the voltage will treble the current and so on. The larger the resistance, the greater the voltage needed to push each ampere of current through it. The voltage in a metal conductor is proportional to the current through it, provided the temperature stays constant. Therefore R=V/I. The current is the flow of negative electrons in a wire. The electrical current is usually measured in amperes (amps). Therefor one ampere equals one coulomb per second. Voltage can be though of as the pressure pushing charges along a conductor is a measure of how difficult it to push the charges along. Resistance can be affected by certain factors: . Length: As you increase the length of the constant wire the resistance increases, because the longer the wire the more energy is needed to push the charges or the electrons along the wire. Therefore voltage must be increased and as you increase the voltage the resistance also increases. Because R=V/I (if the current or I is constant). 2.
An investigation into the relationship between resistance, cross-sectional area and Resistivity.
An investigation into the relationship between resistance, cross-sectional area and Resistivity. Research The equation for finding resistance is R= V/I Where V = potential difference (volts) and I = current (amps) Current is the rate of flow of charge. An amp = 1 coulomb/second. The coulomb is the standard unit of charge. Potential difference is the amount of electrical energy transferred per unit of charge between two points. It is measured in joules per coulomb, or volts. The opposition to the flow of charge is resistance, measured in ohms (?). The larger a materials resistance, the greater the amount of potential difference needed to make a current flow through it. A material such as steel will have a relatively high resistance compared to that of gold. Some materials, known as superconductors have no resistance whatsoever! When a potential difference is applied to a conductor, all the free electrons in it move in the same direction. When the electrons 'move' through the conductor they collide with the atoms in the material, so they are continually accelerating and decelerating. Because of this the electrons do not have a constant velocity, so we give them an average velocity, known as the drift velocity. If the length of the conductor is increased, there will be more atoms for the electrons to collide with, therefore the electrons will have a slower drift velocity,
To find out if the height of a ramp affects the speed of a car trolley.
Science Investigation Physics Aim: To find out if the height of a ramp affects the speed of a car trolley. Prediction: I predict that the speed of the trolley will increase, the higher the ramp gets. Normally when something gets steeper, the speed in which things travel down it increases. This is because of potential energy. The potential energy of an object is made up of three things and they are mass, gravity and height. Those three things multiplied together, equal to potential energy. So if the height increases, the whole equation changes and therefore the speed will increase, since the sum is greater. But that's just the potential energy. I also gathered from my studies, that kinetic energy is equal to potential. So if the potential energy goes up or down, so will the kinetic energy. Here are the equations to prove this. pe= potential energy ke= kinetic energy m= mass h= height g= acceleration due to gravity v= velocity pe= mgh pe= k x h pe x h pe is equal to ke ke= 1/2 mv^2 ke= kv^2 ke x v^2 h x v^2 The equations shown above prove that kinetic energy will increase or decrease with the potential energy. But it also that once the ramp has reached its critical angle, the rule h x v will no longer work. Equipment: A ramp longer than 1.5 metres A metre ruler A stop clock A car trolley Six
What atmosphere does Lorca create in Blood Wedding and how does he create it?
Name: Lasse Bresson Krøner Candidate number: 006 What atmosphere does Lorca create in Blood Wedding and how does he create it? The classical and highly acknowledged play Blood Wedding by Federico Garcia Lorca delivers many symbols and similes which communicates the themes of the play and also create an atmosphere which Lorca directs as he wants it. With an excellent skill of writing Lorca draws the audience into the surreal play with this intense atmosphere. It also makes the spectators understand the deeper meaning of the tale. The atmosphere in the play is ever changing. It starts out as a heavy dark sinister foreboding, the semi-subconscious sense that death will take place in the play with the mentioning of the knife. When it is known that a marriage is to take place the atmosphere is slightly lifted in the joyous occasion. However Lorca quickly shows the conflicts that are taking place within Leonardo and the Bride, and also between them, and the now almost obvious menace that hangs over the setting. The realisation of Leonardo and the Bride's act, confirming the growing tension, now gives expectations of the murder that has been suspected from the start. With the introduction of the Beggar and the Moon there is a violent and an intimidating atmosphere that is abruptly replaced by the calm sorrow of the last scene. It is easy to see how contradicting and profoundly
Resistance of wires
4 JULY 2006 PHYSICS COURSEWORK ~ RESISTANCE OF WIRES Aim The aim of my coursework is based on scrutinising the factors which are responsible for affecting the resistance of a wire in an electrical circuit. I will write a report on a practical I carried out on how the factors affecting the resistance of a wire end up altering the potential difference and current flowing in the circuit. What Is Resistance? The standard opinion of resistance, when electricity is concerned, is the ability of a substance or material to resist the flow of electricity through it. Good conductors are associated with low resistance and poor conductors are associated with high resistance. As resistance is responsible for the current that flows, a high resistance will be responsible for a low current, and, vice-versa, a low resistance will be responsible for a higher current. Resistance is a force which opposes the flow of an electric current flowing around a circuit. This is why a more forceful energy is required to push the charged particles around the circuit (from the power supply). The approved definition for resistance, written in the Hutchinson encyclopaedia that I possess, is: "In physics, that property of a conductor that restricts the flow of electricity through it, associated with the conversion of electrical energy to heat; also the magnitude of this property. Resistance depends on
How the resistance of a wire varies with length
How the resistance of a wire varies with length by Robert Loose Introduction The purpose of this coursework is to find out how and why resistance varies with the different lengths of the wire and to study weither resistance obeys Ohm's Law. I will do so by writing the following coursework 'How the resistance of a wire varies with length'. I will write this coursewrork in the following order: Background Information, Prediction, Apparatus, Diagram, Method and How I Will Make it a Fair Test, Results, Graph, Conclusion and Evaluation. Background Information The bigger the resistance of the components in a circuit, the smaller the current. The wire connecting the components in the circuit is made of thicker copper wire. This causes negligible resistance to the current. During the 1820s, a German physicist, Georg Ohm investigated the resistance of different metals. The unit which we now use for resistance is the ohm in honour of him. Ohm's law is the voltage is proportional to the current. Prediction I predict that after I have found the average voltage, current and then found the resistance, the graph stating the resistance comparing to the length of the wire, will be at a 45 degree angle, I believe this, because it would have to obey Ohm's Law. I will have to however be aware of the following: The type of wire must be the same, the diameter of the wire must be the same,
