Find how varying the current in an electrical circuit affects the strength of an electromagnet.
Aim The target of my investigation is to find how varying the current in an electrical circuit affects the strength of an electromagnet. The c-core that I will be using will be ferromagnetic, meaning that it quickly becomes demagnetised when the current is switched off and that it is very efficient at increasing the strength of the magnetic field created by the current in the wire. It is also known that if there are more coils around the core, the electromagnet is stronger. The type of wire is another factor which will affect an electromagnet's strength. Prediction/Scientific reasoning I predict that as the current increases, the strength of the electromagnet will also increase. I also suggest that there is a relationship of direct proportion between the two variables. For instance, if the current doubles, the strength of the electromagnet will also double. This is possible to be demonstrated when analysing the following equation: Power = Voltage Current › (P=VI) This shows that if the current increases, so does the power, subsequently increasing the strength of the electromagnetic field. This means that as the electromagnetic field is stronger, a larger amount of iron filings will be attracted to the magnetised core. I know that magnetic effects are produced by a moving electrical charge (current). This indicates to me that the current will cause the core to have
EMF Investigation.
EMF Investigation Planning Aim and hypotheses According to Fleming's Rule, electricity is generated when movement occurs in the magnetic field. Alternatively, switching direction of the magnetic field also works. Alternating current is a good way of alternating the field direction. The electricity generated, of in the other words, the electromotive force, is measured in volts. By varying different parts of the apparatus, the EMF output could also vary. The aim of this investigation is to establish a connection between the factors and the output. Possible factors that could be altered in a general apparatus are: * Frequency of field alternation * No of coil of wire in the magnetic field * Strength of magnetic field, varied by * - size of electromagnet * - current used to establish and maintain the magnetism of the electromagnet * - no of coil used to magnetize the electromagnet * Moving the wire in the magnetic field A preliminary experiment, with the same apparatus used, is done earlier on and some useful information was acquired from it. As it was mentioned that alter the direction of the field generates electricity, and it was found out in the preliminary experiment that the more frequent that the field is altered, the quicker would electricity be generated, so by looking at different frequency, perhaps a pattern indicating the relation. In an experiment
My aim is to investigate how to make electromagnets stronger to increase the amount of paperclips the iron bar magnet can pick up.
Electromagnets. Aim: my aim is to investigate how to make electromagnets stronger to increase the amount of paperclips the iron bar magnet can pick up. The investigation consists of us doing a practical experiment in which we have to see what the outcome is by observing whether or not an iron bar magnet wrapped with a wire will pick more or less paper clips by increasing the number of coils. Basic Method: To set up the voltmeter (power pack). Remember leave it on two volts only. To create a circuit this will include the following iron bar magnet with coils around it. Attach to crocodile clips from the power pack to the iron bar magnet. To observe that by increasing the number of coils around the iron bar magnet results in increasing the amount of paper clips that are picked up. Prediction: I predict that by increasing the number of coils the more paper clips I will be able to pick up with the iron bar. This is because when an electrical current flows through the coil wire, a magnetic field will be produced around the coil wire. When the electrical current flows through the coil wire, the weak magnetic field will be concentrated so that the coil behaves like a bar magnet. If the current flowing in the coil is reversed the direction of the magnetic field is also reversed. When I switch the current on the coil will pick up the paper clips. If I want to strengthen the
Cricket - The Rules of Play.
History Cricket is generally considered to be the national game of England. Other countries in which it is popular include Australia, South Africa, Zimbabwe, India, Pakistan, Sri Lanka, New Zealand, and the West Indies. The rules that govern the game all over the world are those drawn up by the Marylebone Cricket Club (MCC) of London in about 1788, as subsequently revised. The most interesting contests include the annual series of international Test matches (played between national teams). The game was introduced into the American colonies in the mid-18th century but never achieved widespread popularity in the United States. The first women's cricket match was played in 1745. In 1958 the International Women's Cricket Council, located in Christchurch, New Zealand, was formed. Facts about cricket Cricket is an outdoor game played with a ball and bat. There are two teams of 11 players each. The cricket ball weighs from about 5.5 to 5.75 ounces which is about 156 to 163 grams. It is made of twine, which is wound around a cork core, which is surrounded in hard leather. The bat is a piece of willow 96 cm long and 11cm wide, with a handle at the top of the bat. The field or ground on which you play on may range in size from about 137-160 meters by 152-168 meters. In the center of the field, there is a pitch, which contains two wickets, 20 m apart. Each wicket consists of three
Determinating of acceleration due to gravity by timing a simple pendulum
Physics Laboratory Report The number and the name of the experiment:Experiment 4- Determinating of acceleration due to gravity by timing a simple pendulum The date of experiment:18 / 1 / 08 Objective * To investigate the relationship between the period and the distance of pendulum bob from the ground * To measure the acceleration due to gravity from the experiment Apparatus * A piece of string at least one meter long * retort stand and clamp * stop-watch * a pendulum bob * g-clamp / heavy stuff(for fixing the stand) * two coins * a table * a chair The diagram of the setup Procedure . Attach the pendulum bob to one end of the light string and nail the string to the coins, and place the coins onto the stand. 2. Set the pendulum bob to swing through a small arc of about 200 3. Measure the time for the bob to complete 20 oscillations. 4. Repeat the timing. Record the results in the table. 5. Change the value of d (the distance of the bob from the ground) stepwise using a step size of about 5cm. Repeat steps 1 to 3 for a total of 10 different lengths. Precaution * Start the stop watch and on the count of zero and stop it on the count of 20. Explanation:When we loosen the hand which holds the bob through an angle about 200 , the bob starts to oscillate, as it hasn't swing forward and back for once, so we should count it for the number" zero". And when it has
The aim of this experiment is to investigate what factors affect the strength of a magnetic field.
Aim: The aim of this experiment is to investigate what factors affect the strength of a magnetic field. Predictions: Michael Faraday, the English scientist, and Joseph Henry of the United States independently showed in 1831 that moving a magnet through coils of wire would generate a current in the wire. If the magnet was plunged into the coil, current flowed one way. When the magnet was removed, the current direction was reversed. This phenomenon is called electromagnetic induction, and it is the principle underlying the operation of the generator. As long as the magnet and the coil move relative to each other, a potential difference is produced across the coil and current flows in the coil. A potential difference is also produced if the magnetic field through the coil grows stronger or weaker. The greater the rate at which the magnetic flux through the coil changes, the greater the potential difference produced. The key is that the magnetic field through the coil must be changing. In 1864 James Clerk Maxwell suggested: (1) if an electric field changes with time, a magnetic field is induced at right angles to the changing electric field. The greater the rate at which the electric field changes, the stronger the induced magnetic field. (2) If a magnetic field changes with time, an electric field is induced at right angles to the changing magnetic field. The greater the
Scalars and Vectors
Paper 1 - Section B: Writing to persuade, argue, advise. During a recent very cold spell, Age Concern brought to the attention of the public, the fact that many elderly people suffer and die because of the substandard damp and cold conditions in which they live. Is it up to the government to improve the living conditions of the elderly, or should we be doing it ourselves? In this essay, I will argue for the proposal that it is the responsibility of the government to improve the living conditions of elderly people and to advise them how they should go about it. As we all know, this year's winter has been the coldest winter for 30 years, but imagine the impact of this on our elderly citizens. The London Met Office announced that this winters average temperature was just 1.5°C, that is a chilling temperature which is barely above freezing point. Over Christmas and at the beginning of this year, the country saw a blanket of snow plunge transport networks into turmoil. Ice shut airport runways, roads were gridlocked and trains broke down. If the average, young or middle-aged citizen finds it difficult to survive in conditions like this, imagine how the elderly must find the conditions of this year's winter. This brings me to talk about how elderly people must suffer from the freezing cold in their homes, vulnerable to many kinds of hazards, right from their front door
Fleming’s Rule Investigation
Fleming's Rule Investigation Planning Aim and hypotheses According to Fleming's Rule, electricity is generated when movement occurs in the magnetic field. Alternatively, switching direction of the magnetic field also works. Alternating current is a good way of alternating the field direction. The electricity generated, of in the other words, the electromotive force, is measured in volts. By varying different parts of the apparatus, the EMF output could also vary. The aim of this investigation is to establish a connection between the factors and the output. Possible factors that could be altered in a general apparatus are: * Frequency of field alternation * No of coil of wire in the magnetic field * Strength of magnetic field, varied by * - size of electromagnet * - current used to establish and maintain the magnetism of the electromagnet * - no of coil used to magnetize the electromagnet * Moving the wire in the magnetic field A preliminary experiment, with the same apparatus used, is done earlier on and some useful information was acquired from it. As it was mentioned that alter the direction of the field generates electricity, and it was found out in the preliminary experiment that the more frequent that the field is altered, the quicker would electricity be generated, so by looking at different frequency, perhaps a pattern indicating the relation. In an
Investigating the Mechanics of the 100 Metre Sprint
Investigating the Mechanics of the 100 Metre Sprint In this assignment, I will be investigating the way in which an athlete run a race of 100 metre and also I will look at other different possibilities such as when an athlete accelerate or decelerate during the race. The course is a track of 100 metres in length and I decided that I would not take into account the wind variation in this model because of lack of information. So therefore I assume that there is light wind that will not affect the time. Before my research I always thought that sprinters run as fast as they can for the whole distance of the race. But in my researches using the Internet and books, I found out that sprinting is a skilful activity just like football kicking and tennis. Such activity must be practised constantly to retain or improve an athlete's level of ability. Currently the world record time of the 100-meter race is 9.79 seconds produced by Maurice Greene. I was able to work out his average speed in the following way: Average speed= 100 = 10.21 m/s-1 9.79 The 100m are a very intense and technical race. Initially the athlete should concentrate totally on his starting technique, which he has fine-tuned in training. Irrespective of the lane or adversaries, he now focuses on a smooth acceleration towards attaining his maximum speed. Once he has attained his top speed, he now relaxes totally
The Agricultural Revolution.
The Agricultural Revolution Britain was a land filled with good soil, which meant that most people's time was occupied in agriculture, feeding themselves and working to live as opposed to living to work. The Open Field System was the main method used and had been since Medieval Times. This involved three open fields, divided into strips and shared amongst the villagers with one field left fallow. Most villagers lived in small homes close to the centre of the village. Many might have gardens in which they grew vegetables or kept animals like pigs. They also could have kept their animals on the common land. The common land was where villager's animals could be kept. Experience handed down from one generation to the next, told farmers that if they grew the same crop year after year, then the soil would become exhausted. Therefore, farmers had allowed one of the villager's fields to rest or lie "fallow" each year. To help the fallow field to recover further, the villagers grazed their sheep and cattle there. The animal's manure put the goodness back into the soil. That field would be called a "fallow field". Also, every year they would vary where each crop would be grown in each field. If the same crop were grown in the same field each year, it would exhaust the soil. They'd keep a field for wheat, a field for barley and a fallow field which animals might be kept in. Then