ELECTRICITY VOCABULARY Exam 26 Questions with Verified Answers
AC current - CORRECT ANSWER the flow of electric charge periodically reverses
... [Show More] direction. In direct current (DC, also dc), the flow of electric charge is only in one direction.
Ampere - CORRECT ANSWER SI dimension symbol: I), often shortened to amp, is the SI unit of electric current (quantity symbol: I, i) and is one of the seven SI base units.
Battery - CORRECT ANSWER a container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
Closed circuit - CORRECT ANSWER An electric circuit through which current can flow in an uninterrupted path. Compare open circuit. A television system in which the signal is usually sent by cable to a limited number of receivers.
Coulomb - CORRECT ANSWER the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere
. Current - CORRECT ANSWER belonging to the present time; happening or being used or done now.
DC current - CORRECT ANSWER is produced by sources such as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type.
Efficiency - CORRECT ANSWER the state or quality of being efficient.
Electric charges - CORRECT ANSWER is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative.
Electric!circuit - CORRECT ANSWER Is a path in which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the "source" of electrons.
Electrical conductivity - CORRECT ANSWER the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.
. Electrical conductor - CORRECT ANSWER is a substance in which electrical charge carriers, usually electrons, move easily from atom to atom with the application of voltage. Conductivity, in general, is the capacity to transmit something, such as electricity or heat.
Electrical insulator - CORRECT ANSWER is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field.
Electrostatic charges - CORRECT ANSWER is the sudden flow of electricity between two electrically charged objects caused by contact, an electrical short, or dielectric breakdown. A buildup of static electricity can be caused by tribocharging or by electrostatic induction.
Kilowatt - CORRECT ANSWER a measure of 1,000 watts of electrical power.
Kilowatt hour - CORRECT ANSWER a measure of electrical energy equivalent to a power consumption of 1,000 watts for 1 hour.
Ohm - CORRECT ANSWER the SI unit of electrical resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt.
Ohm's Law - CORRECT ANSWER states that the current through a conductor between two points is directly proportional to the potential difference across the two points.
Open circuit - CORRECT ANSWER an electrical circuit that is not complete.
Power - CORRECT ANSWER the ability to do something or act in a particular way, especially as a faculty or quality.
Resistance!(units - CORRECT ANSWER between two points of a conductor when a constant potential difference of 1.0 volt, applied to these points, produces in the conductor a current of 1.0 ampere, the conductor not being the seat of any electromotive force. The definition of Ohm in SI basic units is:
Semiconductor - CORRECT ANSWER a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits.
Short circuit - CORRECT ANSWER in a device, an electrical circuit of lower resistance than that of a normal circuit, typically resulting from the unintended contact of components and consequent accidental diversion of the current.
Static electricity - CORRECT ANSWER a stationary electric charge, typically produced by friction, that causes sparks or crackling or the attraction of dust or hair
Voltage - CORRECT ANSWER an electromotive force or potential difference expressed in volts.
watt - CORRECT ANSWER the SI unit of power, equivalent to one joule per second, corresponding to the power in an electric circuit in which the potential difference is one volt and the current one ampere. [Show Less]