Electricity, Magnetism, Electromagnetism
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| The smallest unit of electrical charge is the | electron
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| Electrification occurs through the movement of | electrons only
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| Like charges ___________ and unlike charges ____________. | repel, attract
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| Electrostatic force is ___________ proportional to the distance between charges, and __________ proportional to the product of the charges | inversely, directly
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| An electric potential applied to a conductor produces a magnetic field. T or F | true
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| An electric potential applied to a conductor produces an electric current. T or F | true
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| The charges on an electrified object are distributed | evenly throughout the object
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| True or False: The charges of an electrified object are concentrated only beneath the surface of the object. | false
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| What is a source of direct current | battery
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| A generator is a source of direct current. T or F | false
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| Alternating current is produced by a | generator
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| Ohms law | V= IR
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| Watts, kilowatts, megawatts, amperes all measure what | power
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| Rubber and glass are examples of | insulators
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| The rotation of electrons on their axis is the properly called | electron spin
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| When a group of dipoles align, they create | a magnetic domain
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| What is used to quantify magnetic field strength | Telsa or Gauss
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| The force between magnetic poles is proportional to the ____ of the magnetic pole strengths, divided by the _________ of the distance between them. | product, square
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| Iron, nickel, & cobalt are all considered _____________ materials and they are made up of small groups of atoms called ______________. | ferromagnetic, magnetic domains
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| What is the power rating of a lamp that carries 2A at 120 V | 240W
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| According to electromagnetic induction principles, which of the following situations will serve to increase the amount of voltage produced? | increasing the number loops (turns) in the wire
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| What type of motor drives the rotating anode in the x-ray tube? | induction
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| What type of transformers has one winding, no closed core, and varies both voltage and current | autotransformer
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| Who was responsible for the discovery and determination of electromagnetic induction | Michael Faraday
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| True or False: Positive electric charges in a circuit flow from positive to negative | false
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| What causes more resistance humidity or dry air | humidity
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| True or false: An ammeter would be a device that measures current | true
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| A transformer in which the current is decreased going from the primary side of the circuit to the secondary side would be an example of which of the following? | step up transformer
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| An atom with more electrons than protons will have what charge | negative
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| When an uncharged metallic object experiences a shift of electrons in the electric field of another, this is electrification by | induction
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| T or F: The relationship of xray intensity to distance (inverse square law) is identical to Coulomb's law | true
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| Electrostatic force is inversely related to distance | Coulomb's law
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| How are insulators incorporated to the use of electricity | they are used to contain the electric flow
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| What happens to the current as resistance increases | decreases
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| What type of electric circuit connects all circuit elements along the same conductor | series
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| Which term describes an electric current whose electrons flow in one direction along a conductor | direct
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| What atomic characteristic of a magnetic material creates a dipole | its electrons spin predominantly in one direction
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| An iron bar exposed to a strong magnetic field may become | electromagnet
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| Gadolinium is useful in MRI because it has which magnetic property | paramagnetic
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| According to the laws of magnetism, how many poles will an atomic magnet have | 2
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| What type of electrification occurs when you walk across a carpet | friction
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| What type of electrification occurs when you touch a metal doorknob and you receive a shock | contact
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| T or F: Electrostatic charge distribution is uniform throughout or on a surface | true
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| T or F: Electric charge of a conductor is concentrated along the sharpest curvature of the surface | true
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| the unit of electric potential | volt
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| Materials strongly attracted to magnets are termed | ferromagnetic
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| the unit of resistance | Ohm
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| weakly repelled from both poles of a magnetic field | diamagnetic (water)
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| weakly attracted to both poles of a magnetic field | paramagnetic
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| Which scientist conducted experiments demonstrating that a magnetic field created by a flow of electric current was greater than the Earth's magnetic field (electromagnetism) | Oersted
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| Which conductor angle, in relation to a magnetic field will produce the greatest voltage | 90 degree angle to the field
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| What type of electromagnetic device uses the repulsion of like magnetic poles to create a rotation to convert electric energy to mechanical energy | electric motor
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| Which principle in transformer operation determines whether the voltage will increase or decrease from the primary to secondary coils | turns ratio
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| Which electromagnetic device is defined as operating on the principle of mutual induction to change the magnitude of current and voltage | transformer
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| In a step-down transformer the current on the primary side is _________ than the secondary side | smaller
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| The magnetic field lines of a solenoid move in what direction | from south to north
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| What electrical device allows current to flow in one direction only | rectifier
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| What is defined as the force needed to pass a current of 1 ampere thru a resistance of 1 ohm | volt
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| A superconductor must be __________ in order to maintain its superconductivity | cooled
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| A coiled, current carrying helix is termed | solenoid
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| An electric motor converts | electric energy to mechanical energy
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| An electric current is induced to flow in a circuit if some part of that circuit is in a changing magnetic field | Faraday's law
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| The induced current flows in a direction such that it opposes the action that induces it | Lenz's law
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| The fundamental unit of electric charge | coulomb
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| The unit to measure electric current | amperes
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| momentarily stores electric charge | capacitor
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| imaginary field lines | flux
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| a small magnet created by the electron orbit | magnetic moment
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