# Electricity,Magnetism and Electromagnetism.pptx

May. 30, 2023
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### Electricity,Magnetism and Electromagnetism.pptx

• 1. Magnetism,Electromagnetism,El ectric Current & Electric Power Akash Panwar
• 2. CONTENTS 1 0 / 5 / 2 0 2 3 2 S.No 1. Magnetism 2. Magnets 3. Electromagnet 4. Electromagnetic Induction 5. Electric Current 6. Electric Power
• 3. MAGNETISM + Magnetism is a force that causes certain materials to attracts or repel each other. + This force is caused by the motion of electrons within atoms. + When electrons spin in the same direction,they create a magnetic field. 3
• 4. + There are three types of magnets; + Naturally occurring magnets, + Artificially induced permanent magnets, + Electromagnets 4 MAGNETS
• 5. + Many materials are unaffected when brought into a magnetic field. Such materials are nonmagnetic and include substances such as wood and glass. + Diamagnetic: Weakly repelled e.g. Water and Plastic. + Ferromagnetic: Strongly attracted by a magnet e.g. Iron, cobalt, and nickel. + Paramagnetic: Lie somewhere between ferromagnetic and nonmagnetic e.g. Contrast agents used in MRI are paramagnetic 5
• 6. + An Electromagnet is a magnet that is created by the flow of electric current through wire. + The strength of the magnetic field can be controlled by varying the amount of current flowing through the wire. + Electromagnets are used in a wide range of applications, from electric motors to MRI machines. + A moving charge creates a magnetic field called electromagnetism. 6 ELECTROMAGNET
• 7. + Magnetic induction is the process of creating a magnetic field in a material by placing it in a magnetic field. + When a magnetic material is placed in a magnetic field, the electrons in the material align themselves with the magnetic field, creating a net magnetic field. + This process is used in the construction of transformers and electric generators. 7 ELECTROMAGNETIC INDUCTION
• 8. + Electric current is the flow of electric charge in a circuit. + Measured in Ampere (A) + Ohm’s law + Ohm’s law states that the current flowing through a conductor is directly proportional to voltage across it, and inversely proportional to its resistance. Where, I =current V= voltage R= resistance 8 ELECTRIC CURRENT I = V/R
• 9. + Electric power is the rate at which electrical energy is transferred or consumed in a circuit. + Measures in Watts (W) + Represented by “P” Where, V = voltage I = current 9 ELECTRIC POWER P = VI
• 10. Thank You 1 0