Find out what kind of effect the strength of an electromagnet has if the number of turns on the coil and the current going through the coil are increased.
Physics Investigation Electromagnets Aim My aim for this experiment is to find out what kind of effect the strength of an electromagnet has if the number of turns on the coil and the current going through the coil are increased. Background Electromagnetic induction is the idea that magnetism can travel from one object to another even though they are insulated. A greater number of coils in the solenoid around the core will increase the strength of the field produced by that electromagnet. This is because the amount of power given to the solenoid and core is increased so the core receives an increase in power, so the domains become aligned strongly, and more domains become aligned. In addition, with an increase in coils the coils cover a greater surface area of the core. This means the coil covers more domains and therefore more domains are influenced. Each turn has it's own field so more turns mean more fields. The greater amount of turns causes constructive interference, which increases the size and strength of the magnetic field. The type of wire also affects the strength of the electromagnet. If a wire is thicker then current can flow more easily and the current will increase so the strength of the electromagnet will increase. In addition, the length of wire may also affect the
Of all of the early scientists of the scientific revolution I am most impressed by Sir Isaac Newton.
Of all of the early scientists of the scientific revolution I am most impressed by Sir Isaac Newton. Newton is important because he contributed more to the development of science than any other person in history. Isaac Newton is remembered as the greatest scientific genius who ever lived. His discoveries about physics, light, and mathematics changed the world. I am even more impressed by what he overcame to reach his goals. He came to surpass even his own expectations. I am more impressed with the man than with the discoveries. So many people in history are viewed as larger than life, which can be dehumanizing. Newton was very much a human with very human emotions. Isaac Newton came from a family of farmers. His father dies three months before he was born. Isaac's father was a wealthy landowner but was uneducated and could not even sign his own name. Isaac did not lead a privileged life; he was basically treated like an orphan. Isaac had a very unhappy childhood. Isaac is only ten when his grandfather, James, dies and James left him nothing in his will. There is also no doubt that Isaac felt very bitter towards his mother and stepfather. When he was reflecting on his sins at age 19 he wrote: "Threatening my father and mother to burn them and the house over them." Upon the death of his stepfather, Isaac lived with his extended family including his mother, grandmother,
Investigation in to what happens to the resistance of a thermistor as its temperature changes.
Physics Coursework Danielle Roots Mr Small Aim: To investigate what happens to the resistance of a thermistor as its temperature changes. What is a thermistor? Is a resistor that changes in resistance with temperature. "Its principle characteristic is that their electrical resistance changes in response to changes in their temperature." http://www.betatherm.com/therm_theory.html Symbol for a Thermistor: Calculating resistance Resistance in a circuit can be calculated using the levels of voltage and current in a wire or a single component. The formula we use to measure resistance is: RESISTANCE = VOLTAGE R = V CURRENT I What is Current? Current is the flow of electrons around an electric circuit. It is measured in amps. Current is measured in Amps. amp = 1 coulomb per second Per means divided by so current = charge time What is resistance? Resistance is the measure of how much the current is slowed down. The bigger the resistance, the smaller the current. Resistance is measured in Ohms (symbol ?). What Causes Resistance? [ Parallel Circuits Series Circuits Only has one path for the charges to move along. Charges must move in "series" first going to one resistor then the next. If one of the items in the circuit is broken then no charge will move through the circuit because there is only one path. There is no alternative
To Determine the Focal Length of a Convex Lens.
To Determine the Focal Length of a Convex Lens. Aim: To determine the relationship between the power of the vocal lens, object and the image distance from the lens. Apparatus: Bulb Projector Convex lens Lens holder Screen Optical Bench 12V power supply Diagram: Method: * Set up the apparatus as shown in diagram. * Put the focal lens at the first distance shown on the results. Also put the object at the 0 point of the optical bench. * Switch the 12V bulb and move the projector until a clear picture of the object is visible. * Record the results on the results table of the distance from the lens to the projector * Keep on moving the object to the 6 points shown on the results table and record the distances when object is visible for each measurement * I will do the experiment twice for each measurement to ensure that the results are accurate Safety: Making sure that all bags are put under tables will make this experiment safe. Also the work surface will be cleared of all books and other mess, which will mean that the table will be empty and easier to work on. The bulb will be hot so I will make sure that no one touches it or looks directly at it because it will also be very bright. Theory: The distances from the lens to the screen (U) as well as measuring the distance from the lens to the projector (V) will make me think of a formula. I have obtained a
Setting up a Light Microscope.
Setting up a Light Microscope Aim: To set up a Light Microscope Microscopes came into existence in 1670. It was a man called Antoni Van Leeuwenhoek who came up with this innovative idea of inventing a Microscope. Soon his invention was very popular. Scientists everywhere started to utilize similar microscopes. Microscopes have been an asset to the scientific industry. We nowadays use microscopes to things in a greater detailed picture. The naked eye cannot see an onion cell, to observe the onion cell we need to use a Light Microscope. When using a Light Microscope we can adjust the magnification to what we desire. A light microscope is an excellent piece of equipment to use when distinguishing between an animal and plant cell. There are many types of microscopes. Two common microscopes are the Light Microscope and the Electron Microscope. Electron Microscopes are those that are used in big science laboratories. They can magnify up to a huge 500,000x. Whereas, a standard light microscope can only magnify upto 1000x. There is also a massive price difference between the two microscopes. An Electron Microscope can cost up £2.5 Million and a good light microscope will only cost about £50. Method You have to be very careful when using a light microscope. Follow these i9nstructions to setup and use the microscope properly. * First of all place the microscope in the
A2 OCR B Advancing Physics Coursework - Research and Report - The development of a Theory of Gravity
The development of a Theory of Gravity. What's behind it and where does it stand in relation to the other forces? Abstract: The Theory of Gravity has been transformed through the last century, from an original and important classical framework to more recent relativistic and then quantum interpretations, eventually culminating in a specific requirement to link it all together with the other forces and create a unified theory of everything. The search for unification is currently very much dependent upon experimentation and raises questions as to the scientific validity of String Theory and whether it exists as science or philosophy - or indeed just an elegant, but meaningless, example of mathematical aesthetics. . Introduction The ultimate goal for physicists is to devise a unified theory, which describes the universe all in one go. However, this proves difficult - there are partial theories which do not fit together, each predicting a limiting number of observations and neglecting others. Nevertheless the Standard Model exists as a framework for the coming together of partial theories. .1 The Basics of the Standard Model In matter there appears to be four basic forces at work. Gravity is the weakest of the four but acts over great distances, binding stars and galaxies together. The electromagnetic force is stronger and is responsible for holding atoms and molecules
Investigating the Resistance Of A Light Bulb As The Voltage Is Increased.
Investigating the Resistance Of A Light Bulb As The Voltage Is Increased. Plan Resistance is the confrontation of electrons flowing through an electrical component. The resistance slows down the flow through the component, due to the friction created. The current in a circuit gets smaller the bigger the resistance is. To work out resistance you can use this formula: Ohm's Law - R= V (Resistance = Voltage/ Current) I To measure the resistance in a circuit you would need to find out what the voltage and the current is in the circuit. To find the voltage of a light bulb in a series circuit and hence the voltage of the circuit you would need to use a voltmeter, which would be connected in parallel with the light bulb to find the voltage across the bulb. (See diagram below). Then you would need to find the current in the series circuit by placing an ammeter in the circuit, which would give you the current of the circuit as well as the bulb current. (See diagram below.) To find the resistance of the circuit, you would then divide the voltage by the current. For this experiment I will be using a series circuit rather than a parallel circuit. This is because I only need to test the resistance of one light bulb rather than testing three or four light bulbs in a parallel circuit. This way the lamp will be more efficient. Safety To make sure that the test is safe, I would
Measuring The Constant g; The Acceleration Due To Gravity
AS Physics Investigation - Measuring The Constant 'g'; The Acceleration Due To Gravity Contents Abstract - Page 1 Introduction - Page 2 Equipment Listing - Pages 2-3 Preliminary Investigation - Pages 3-4 Final Methods - Pages 4-5 Results Tables & Statistical Analysis - Pages 5-7 Conclusions To Data - Page 7 Evaluation Of Experiment - Page 8 Abstract The gravitational field strength , also referred to as the 'acceleration due to gravity' (symbol 'g') is a crucial fundamental constant which affects the motion of all objects from within earth's gravitational field. For this investigation, I chose to measure this using suitable methods obtained from research into the calculation of 'g', and ultimately I had successfully done so to a substantial degree of accuracy, making it a success overall. The two main techniques which I used to measure this are as follows: ) Dropping a preferably large and dense object from various heights, and timing how long it takes to fall to the ground. The displacement 's' and time 't' are related to 'g' by this formula: s = 1/2gt( Which rearranges to: g = 2s/t( 2) This method involved timing the swings of a pendulum , with a solid mass suspended by a string of a given length. The period of a pendulum (the time for one back and forth oscillation) is given by: P = 2?v(L/g) Where 'L' is the length of the string. In order for me to
Induction motors
Induction motors Induction motors use electromagnetic induction to rotate a shaft or rotor and create mechanical energy from electric energy. With minimal design alterations an electric motor like this also has the ability to create electricity from mechanical energy, although these motors are referred to as generators. Electromagnetic induction is the production of an electrical potential difference (or Voltage) across a conductor situated in a changing magnetic field. Faradays Law states that electromotive force (EMF) produced along a closed path is proportional to the rate of change of the magnetic flux through any surface bounded by that path. In practice, this means that an electrical current will flow in any closed conductor, when the magnetic flux through a surface bounded by the conductor changes. This applies whether the field itself changes in strength or the conductor is moved through it. (http://www.absoluteastronomy.com/encyclopedia/e/el/electromagnetic_induction.htm) This rule governs the design of all induction motors, generators, transformers and most electrical devices. The most basic Induction motor is the Squirrel cage motor. Squirrel cage motors are the most common industrial AC motor, when running off a constant AC supply they are simply constant speed devices. They acquired there name from the rotors used which resemble a squirrel running cage. This
Investigating the factors affecting the size of current flowing through a length of resistivity putty.
04/02/97 ????? GCSE PHYSICS SC1 INVESTIGATION 996/7 INVESTIGATING THE FACTORS AFFECTING THE SIZE OF CURRENT FLOWING THROUGH A LENGTH OF RESISTIVITY PUTTY. CANDIDATE NUMBER 6247 CENTRE NUMBER 15131 PLANNING AIMS The main aim of this investigation will be to investigate the factors that have an effect on the size of the current passing through a length of resistivity putty. I will also try to explain my results using a number of models formulae and theories including Ohm's law, the formula for resistivity and a water model. VARIABLES Below is a list of the variables which are likely to have a major effect on the size of the current passing through a length of resistivity, putty: . The length of putty used. 2. The cross-sectional area of the putty. (Including the amount of contact between the plates and the putty). 3. The temperature of the putty. 4. The voltage across the putty. 5. The resistance of the wires etc. and the contact resistance between the plates and the putty. Other factors, for example the density of the carbon inside the putty, or the pressure at which the experiment is carried out, may also have an effect on the size of the current, however these factors would either be difficult to control in a school physics laboratory or are not likely to have a significant effect compared to the inaccuracies of the experiment. The two
