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