Taylor Blakely PHY 174 – J TA: Rabindra Pahari Formal: Science Column #2 Due: 04/29/2014 Current Flow in Circuits Electric current: the flow of electric charge; moving electrons are what often carry this charge through a wire. Current can also be carried by ions; however, for this column the focus will be on the current carried in a wire by moving electrons or individual moving charges. This current flow produced is measured as a rate of one Coulomb (C) that moves through a cross-sectional area per second, otherwise known as an Ampere. Once a current is placed in a circuit, the current will continue to move through that circuit as long as there is a potential difference present. This potential difference is more commonly known as a source of emf which can be thought of as a charge pump; examples of a source of emf would be a battery or a generator. Electric current causes many different outcomes, or consequences depending on the system that the current is acting in. These different aftereffects include heating and inducing magnetic fields. Currents can also be manipulated by resistors and capacitors. Among that, the way the resistors and/or capacitors are arranged in the circuit will have a particular effect on the current. This means that if resistors are in parallel, the current will behave differently that in they were in series; the same concept applies to capacitors. The scientific column to follow will attempt to better explain current in circuits that contain only resistors or resistors and capacitors. When a potential difference is applied to a wire, it creates an electric field that as a result yields a current. Due to this relationship, it is found that the current is proportional to the potential difference and the... ... middle of paper ... ...t malfunction, a person may need to have a pacemaker put in place in their chest because their heart can no longer produce the current naturally. This pacemaker produces an artificial current that is transferred to the tissue that allows the heart to generate a pulse and beat on its own. Circuits are also present in households and vehicles. Circuits are present on the engines of cars to aid in starting the engine and controlling all of the electronics in the car. In households, a circuit is typically present in the breaker box of the house. Here, circuits are used as a safety feature and if too much current is passed through a specific point in this box, a switch will automatically flip and end the flow of current. Current flow is very pertinent in the everyday life of people; however, it is never thought of as more than something we use to make it through the day.
Electricity is an interesting subject. There is so much you can learn from it, like how our lights turn on or how we make cell phones. This is all a mystery until we finally get a little bit of information in our brains. I've just read two articles, "Energy Story" and "Conducting solutions". I also watched a video called Hands-on Science with Squishy circuits. I learned so much valuable information from these resources.
After reading the circuit by Francisco Jimenez, it talks about the struggles of an immigrant, and the obstacles they have to overcome. I can’t really relate because I never had to move from place to place, and have to deal with a new language. Even though I have always wanted to travel and move to a different country. But over the last year I’ve moved from Atlanta to Douglas, and having to adapt to new cultures, types of people, and just the new vibes was really different. Back in elementary school I had a friend named Johnny and he was an immigrant. I feel like he could relate to this story a lot more since he didn’t really know English and his family heavily struggled financially. It was difficult for teachers even trying to
When a positive and a negative electrode are placed in a solution containing ions, and an electric potential is applied to the electrodes, the positively charged ions move towards the negative electrode, and the negatively charged ions to the positive electrode. As a result, an electric current flows between the electrodes. The strength of the current depends on the electric potential between the electrodes and the concentration of ions in the solution. Ionization is the formation of electrically charges atoms or molecules.
A battery is a device which converts chemical energy into electrical energy. A battery usually consists of two or more cells connected in series or parallel, you can also have a single cell battery. All cells consist of a positive electrode, and a negative electrode. An electrolyte is a liquid substance capable of conducting electricity. In this substance one of the electrodes will react producing electrons, while the other will except electrons. When the electrodes are connected to a device to be powered, called a load, an electrical current flows.
Merriam Webster defines Galvanism as “a direct current of electricity especially when produced by chemical action”. The term Galvanism is actually derived from
Wire time (or panghantar such as an antenna) conducts alternating current, electromagnetic radiation is propagated at the same frequency as the electric current. Depending on the situation, electromagnetic waves can be waves or like particles. As a wave, characterized by speed (speed of light), wavelength, and frequency. When considered as particles, they are known as photons, and each has an energy associated with the frequency of the waveform shown by the Planck relationship E = Hν, where E is the photon energy, h is the Planck constant - 6.626 × 10 -34 J · s - and ν is the frequency of the
When introduced into an ionic solution, positively charged ions will be electrostatically attracted to the anode and the negatively charged ions will be electrostatically attracted to the cathode. This act of moving ions means that charges are able to move from anode to the cathode and complete the circuit. These moving ions are essentially the same as moving electrons (electricity). This process of putting electrodes into a solution, using a direct electric current (D.C.), and separating chemicals based on their charge is known as electrolysis
I am writing this essay to explain to you what is going on in the circuit that was given to me. I will explain with the best of my knowledge so that you can fully understand what is happening in the circuit. The inductor and the wires are assumed as being ideal. The AC voltage source has an infinitely variable frequency (0≤f≤∞). The values of all the resistors, capacitor, and inductor are constant.
The Relationship Between Length, Width and Resistance of a Wire Aim: To investigate how the length and width of a wire affects the resistance of the wires. What is the resistance to a s Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. gold has less resistance to the sand. For example, gold has more free electrons than. iron and, as a result, it is a better conductor.
A conductive atom’s valance shell is not completely full; electrons will flow from atom to atom because of this. When these electrons move from one atom to another, that is electrical current (a brief description of that is). A magnet can be made from different materials, but a loadstone is the natural form. The most important part of magnetism to make electric motors work is: A magnet has two different ends, or poles, a north and a south pole. These poles behave like electric charges, like poles repel and unlike poles attract although magnets have no effect on still charges.
Electricity and electrical components are a major part of our lives today. Our lives pretty much come to a halt if there is a power outage or if our electrical devices stop working, sometimes we even start panicking because we are so dependent on these components that we cannot afford to lose them and their importance and use only increases as time passes. We all use these electrical devices and also electricity itself but most of us do not think about the math and physics that works behind all of these things.
There is an important relation in electricity, that is Gauss’s Law. The Gauss' law is a method widely used in electrical applications to calculate electric fields from symmetrically charged objects, it is developed by Mr. Carl Friedrich Gauss, a German mathematician and physicist.
All useful generators of electricity come in two basic forms, alternating current and direct current. Direct current (dc) comes from generators that do not change in polarity, always producing a positive charge. In alternating current (ac) the polarity of the terminals is always changing from positive to negative. Thus you are left with alternating current flow. There are different ways of measuring and generating alternating and direct current.
Electric currents produce magnetic fields, they can be as small as macroscopic currents in wires, or microscopic currents in atomic orbits caused by electrons. The magnetic field B is described in terms of force on a moving charge in the Lorentz force law. The relationship of magnetic field and charges leads to many practical applications. Magnetic field sources are dipolar in nature, with a north and south magnetic pole. The magnetic field SI unit is the Tesla, it can be seen in the magnetic part of the Lorentz force law F magnetic = qvB composed of (Newton x second)/(Coulomb x meter). The smaller magnetic field unit is the
Humans these days take electricity for granted. We don’t truly understand what life was like without it. Most young adults will tell you their life does not depend on electricity, but they aren’t fooling anyone. They all know that their life depends on electricity; whether it’s television, their phone, Google, or the lights in their house. We need to stop taking those things for granted and give credit where credit is due. That is why I chose to write about the scientists who contributed to the discovery of electricity, which then helped modern scientists fuel the electricity phenomenons we now have today.