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front 1 Electrostatatics | back 1 The study of fixed or stationary electric charge |

front 2 Electrodynamics | back 2 The study of electric charges in motion |

front 3 Electrification | back 3 Is the process of adding or removing electrons from a substance |

front 4 Electrification can be created by | back 4 Contact Friction Induction |

front 5 Electrostatic law # 1 | back 5 Unlike charges attract; like charges repel |

front 6 Electrostatic law # 2 | back 6 Electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them (Coulomb's Law) |

front 7 Electrostatic law # 3 | back 7 When an object becomes electrified, the electric charges are uniformly distributed throughout the object or on its surface |

front 8 Electrostatic law # 4 | back 8 The electric charge of a conductor is concentrated along the sharpest curvature of its surface |

front 9 What is the coulomb's law | back 9 Electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them F=k QaQb/d square |

front 10 Name a device that applies the fourth law of electrostatics | back 10 Cattle Prod |

front 11 Super conductor | back 11 Is the property of some materials to exhibit no resistance below certain critical temperature. Example: Niobium, Titanium |

front 12 Conductor | back 12 Is any substance through which electrons flow easily. Most metals are good electric conductors; copper, aluminum |

front 13 Semiconductor | back 13 Is a material that under some conditions behaves as an insulator and in other conditions behaves as a conductor. Example: Silicone and Germanium |

front 14 Insulator | back 14 Is any material that does not allow electron flow. Wood , glass, cloth , rubber, plastic |

front 15 What is the relation between electric resistance and electric current | back 15 Ohm's Law. Increasing electric Resistance result in reduced electric current |

front 16 Unit of voltage | back 16 Volt (V) |

front 17 Unit of Current | back 17 ampere(A) |

front 18 Unit of Power | back 18 Watts (W) |

front 19 Define Ohm's law | back 19 The voltage across the total circuit or any portion of the circuit is equal to the current multiplied by the resistance V= I x R |

front 20 If a current of 2A passes through a conductor that has a resistance of 6 ohm, what is the voltage across the conductor? | back 20 V=IR V=2A X 6 ohm =12 |

front 21 A kitchen toaster draws a current of 2.5 A. If the household voltage is 110V, what is the electric resistance of the toaster | back 21 V=IR R=V/I 110V/2.5A= 44 Ohm |

front 22 Formula to create the total resistance of a circuit in series | back 22 The total resistance is equal to the sum of the individual resistance RT = R1+R2+R3 The current through each circuit element is the same and is equal to the total circuit current IT=I1=I2=I3 The sum of the voltages across each circuit elements is equal to the total circuit voltage VT=V1+V2+V3 |

front 23 Circuit in parallel formulas | back 23 The sum pf the current through each circuit element is equal to the total circuit current IT=I1+I2+I3 The voltage across each circuit element is the same and is equal to the total circuit voltage VT=V1=V2=V3 The total resistance is the inverse of the sum of the reciprocals of each individual resistance 1/RT=1/R1+1/R2+1/R3 |

front 24 Example of parallel circuit 5,4,2 find the total resistance | back 24 1/RT=1/5+1/4+1/2 LDC 19/20 20/19 = 1.05 |

front 25 What is the difference between direct current and alternating current | back 25 Direct current the electron flow in one direction through the conductor Alternating current the electron flow alternatively in opposite direction |

front 26 Draw a graph to represent alternating and direct current | back 26 no data |

front 27 What is the unit of electric power | back 27 Watts (W) |

front 28 Define one watt | back 28 One watt is equal to one ampere of current flowing through an electric potential of 1 volt P= I x V |

front 29 Any charged particle in motion create a | back 29 Magnetic field |

front 30 The lines of magnetic fields are always | back 30 perpendicular to the motion of the particle |

front 31 What is the magnetic permeability | back 31 The ability of a material to attract the lines of magnetic field intensity |

front 32 Explain paramagnetic materials | back 32 Slightly attracted to a magnet. The degree of magnetism exhibited by a material is related to the number of unpaired electron in the outer shells. (contrast materials used in MRI) |

front 33 Explain diamagnetic materials | back 33 Known as non magnetic. Weakly repelled by either magnetic pole. Can't be artificially magnetized. Example water and plastic |

front 34 Explain ferromagnetic materials | back 34 Strongly attracted by magnet. Can be permanently magnetized. Examples are iron, cobalt , nickel and rare earth ceramics . An alloy of aluminum, nickel and cobalt called alnico is one of the more useful magnets produced. |

front 35 Explain magnetic susceptibility | back 35 The degree to which various material can be magnetized . Ion has high magnetic susceptibility |

front 36 The imaginary lines of the magnetic field leave the | back 36 north pole and enter the south pole |

front 37 What is the SI unit of magnetic field strength | back 37 Tesla |

front 38 What was the older unit used for magnetic field strength | back 38 Gauss |

front 39 1 Tesla = | back 39 10,000 gauss |

front 40 Helix | back 40 no data |

front 41 Solenoid | back 41 A coil of wire |

front 42 Electromagnet | back 42 no data |

front 43 Faraday's law | back 43 An electric current is inducted to flow in a circuit if some part of that circuit is a changing (moving) magnetic field |

front 44 According to Faraday's law, the magnitude of the inducted current depends on four factors | back 44 Strength of the magnetic field Speed at which the magnetic field moves The number of turns in the conductor Angle of the conductor to the magnetic field |

front 45 Varying magnetic field intensity induced an | back 45 Electric current |

front 46 What is the function of an Induction motor | back 46 Powers the rotating anode of an x- ray tube |

front 47 What is the function of a transformer | back 47 Changes the intensity of alternating voltage and current |

front 48 Autotransformer, step up transformer and step down transformer | back 48 Auto transformer: Self Induction Step up transformer: Mutual Induction Step down transformer: Mutual Induction |

front 49 Advantage of a shell type transformer | back 49 Confines more on the magnet field lines of the primary winding because the secondary is wrapped around it and there are essentially two closed cores. |

front 50 Transformer law | back 50 Transforms electric potential and current into higher or lower intensity Vs/Vp=Ns/Np Ns/Np is known as the turns ratio of the transformer |

front 51 The secondary side of a transformer has 300,000 turns; the primary side has 600 turns. What is the ratio? | back 51 Ns = 300,000 Np = 600 300,000/600= 500:1 |

front 52 Copper loss | back 52 Energy dissipated by resistance in the wire used ,to wind a coil |

front 53 Hysteresis loss | back 53 Magnetic friction in the core due to changing magnetic field |

front 54 Eddy current loss | back 54 Power loss due to electric currents induced in the core |