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Reistance
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Ama Oliver 11JS Resistance Coursework Experiment to Verify Ohm’s law - Resistance Course Work Introduction - Ohm’s Law Ohm’s Law is a mathematical formula that expresses the relationship between the electromotive force, electric current, and resistance in a circuit. The German Physicist, George Ohm discovered this relationship in 1826. When applied to a direct-current circuit, Ohm’s Law states, that the electromotive force (E) measured in volts =the current (I) in amperes multiplied by the resistance (R) in ohms; therefore E = IR. When the law is used for an alternating-current circuit, resistance is replaced by impedance (Z), also in ohms. The flow of alternating current produces a counterelectromotive force, which resists the current. The strength of such resistance depends on how rapidly the current alternates. Impedance consists of resistance, called reactants combined with the circuits regular resistance to direct current. Electricians use Ohm’s Law to determine the efficiency of circuits. For example, they can calculate how the flow of current will be affected by various arrangements of such circuit components as connecting wires, capacitors and resistors. Electric Current Electric Current is the movement or flow of electric charges. A charge can be either positive or negative. The protons that make up part of the nucleus of every atom have a positive electric charge. The electrons that surround the nucleus of every atom are negatively charged. An electric current can consist of positive, negative or both types of charge. Direct and alternating current An electric current is either direct or alternating, depending on its source. Direct current (DC) flows in the same direction. Alternating current (AC) regularly reverses its direction of flow. It is produced by AC generators and is used in most homes. Each time AC completes two changes of direction, it goes through one cycle. The number of cycles per second is called the frequency of the AC.
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Paper Information
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Title: Reistance
Words: 1500
Rating: None
Pages: 6
submitted by: Aquanetta
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