ELECTRICITY MR.ROBINSON Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects‚ such as lightning‚ static electricity‚ electromagnetic induction and the flow of electrical current. In addition‚ electricity permits the creation and reception of electromagnetic radiation such as radio waves. In electricity‚ charges produce electromagnetic fields which act
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Electrical Current An electric current is a flow of electrical charge. When a metal conducts electricity‚ the charge is carried by electrons moving through the metal. Electrons are subatomic particles with a negative electrical charge. When a solution conducts electricity‚ the charge is carried by ions moving through the solution. Ions are atoms or small groups of atoms that have an electrical charge. Some ions have a negative charge and some have a positive charge. Citric Acid Citric acid is
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CHAPTER - 12 ELECTRICITY HOTS Questions for Practice 1. Name a substance whose resistance almost remains unchanged by increase of temperature. 2. Name two special characteristics of heater coil. 3. A wire of resistance 4 ohms is bent to form a circle. What is the resistance between two diametrically opposite ends? 4. How does the resistance of a conductor change if its temperature is increased? 5. A current of 4A flows in a wire of resistance 60 ohms. Calculate electrical energy consumed in 2 minutes
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Lightning - Each bolt can contain up to one billion volts of electricity - Electrical discharge is caused by an imbalance between positive and negative charges in the atmosphere - Colliding particles of rain‚ ice‚ or snow increase this imbalance and often negatively charge the lower reaches of storm clouds - Objects on the ground‚ like steeples‚ trees‚ and the Earth itself‚ become positively charged - A step-like series of negative charges‚ called a stepped leader‚ works
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dependent on electricity‚ it seems‚ virtually‚ impossible to think if we can ever live without it. When an hour or so of load-shedding‚ especially on a hot summer day‚ can make us fret and fume and curse the whole system‚ what would happen‚ if this great boon is taken away from us forever? The whole life would come to a grinding halt‚ forcing all of us to experience the dull‚ dark‚ boring and uneventful period of the stone-age. As a matter of fact‚ to conceive of a life without electricity is‚ virtually
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generate electricity‚ and some use nuclear power‚ but there is an increasing use of cleaner renewable sources such as solar‚ wind‚ wave and hydroelectric. Types of power generating plants Electricity can be generated using the kinetic energy of water‚ heat energy of the sun and coal‚ or from the nuclear energy released from the fission of nuclear fuel. Nuclear Power Plants Nuclear power plants work on the chemical process of fission. Nuclear reactors are used to generate electricity. Fission
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Better teaching through provocation The quest for an effective pedagogy differentiates the teacher from the researcher. Within the humanities and social sciences‚ we are constantly confronted with the challenge of communicating complex material in a novel and effective manner. Active teaming is bolstered by an approach that emphasizes creative problem solving‚ and critical thinking. And active learning often begins with a question. Despite those techniques‚ philosophical inquiry can
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Early History of Electric Power Date Event Pictures 1800-1819 Early electric experiments were performed with DC. In 1800‚ Alessandro Volta published a description of a silver/zinc battery‚ acknowledging that he did not know how it worked. In 1807‚ Humphry Davy constructed a practical battery (the picture will be immediately familiar to anyone who works with UPS systems)‚ and demonstrated both incandescent and arc light. • Volta’s famous bi-metalic frog twitch (I did this one myself as a boy..
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What is Electricity? Electricity is one of the most powerful forces in our lives. As a matter of fact‚ it can even kill you. The most vital part of electricity is called electric energy. This is what we commonly think of when we hear the word electricity. “Electricity” reminds us of anything that we plug into an electrical outlet in order to make it work‚ such as lights‚ refrigerators‚ video games‚ microwaves‚ and computers. Scientists discovered ways to produce electric energy in large amounts
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Electricity and Magnetism Electricity Circuit symbols Potential difference The energy which is delivered to an electric circuit comes from the supply. The greater the potential difference of the power supply the more energy is delivered. Potential difference is measured in volts‚ which has the unit symbol V. Cells in series The more chemical cells that are connected in series the greater the potential difference that they supply. The potential difference of a number of cells connected
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