| A | B |
|---|
| A current that reverses itself at a regular frequency | alternating current |
| A meter for measuring current. | ammeter |
| SI unit of current. A fundamental unit. | ampere |
| The transfer of charges from one body to another by contact. | conduction |
| A measure of the ability of materials to carry current. | conductivity |
| A material that has low resistivity for electric current. | conductor |
| Unit of electric charge. | coulomb |
| The force between two fixed point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. | Coulomb's Law |
| The movement of electric charges in one direction around a circuit. | direct current |
| Resistance of a single resistor that could replace a combination of resistors. | effective resistance |
| Continuous path through which charge can flow. | electric circuit |
| The flow of electric charges | such as electrons in a metallic conductor or |
| The time rate of flow of charged particles. | electric current |
| Equal to electric power times time; = VIt | electric energy |
| The region of space around a charged object that affects other charges. | electric field |
| field exerts on a charge to the magnitude of the charge. | electric field intensity |
| The total work done by an electric field in bringing 1 coulomb of positive charge from infinity to a specific point. | electric potential |
| Equals volts times current in a device or circuit. | electric power |
| field is produced by passing a current through the coil. | electromagnet |
| A force resulting from the motion of electric charge. | electromagnetism |
| A fundamental..... negatively charged... subatomic particle | electron |
| The unit negative electric charge. | electron |
| A unit of energy equal to the work needed to move an elementary charge across a potential difference of 1 volt. | electron volt |
| A unit of energy equal to 1.6 E-19 joule. | electron volt |
| A device for detecting the presence of electric charges. | electroscope |
| The magnitude of charge present on a proton or an electron. Approx. = 1.6 E-19 coulomb. | elementary charge |
| An instrument used to detect and measure very small electric currents | galvanometer |
| A device that converts mechanical energy into electrical energy. | generator |
| An extremely large source or reservoir of electrons; used to neutralize a charged object. | ground |
| Connecting a charged object to the earth to remove the objects charge. | grounding |
| A process by which a charged object causes a redistribution of charges in another object without contact. | induction |
| A material that is a very poor conductor because it has few "free" or conducting electrons. | insulator |
| An atom or group of atoms having an electric charge | ion |
| The charge on body possessing an excess of electrons. | negative charge |
| A body with an equal number of electrons and protons. | neutral body |
| The unit of electrical resistance. | ohm |
| The electrical resistance through which it takes one volt to produce a current of one ampere . | ohm |
| At constant temperature | the ratio of the difference in potential across a metallic conductor to the current is constant. |
| A electric circuit in which there is more than one current path. | parallel circuit |
| A charge with negligible physical dimensions. | point charge |
| The net charge on an object with a deficiency of elections. | positive charge |
| The change in energy per unit charge as a charge is moved from one point to another in an electric field. | potential difference |
| A device | or material |
| The opposition to flow of charge. | resistance |
| A quantity that allows the resistance of substances to be compared. | resistivity |
| A circuit in which there is one current path. | series circuit |
| An electric circuit in which the resistance is so low as to permit a dangerous current to flow. | short circuit |
| A coil of wire wound as a helix. When current is passed through the coil it becomes an electomagnet. | solenoid |
| Electric charges at rest. | static electricity |
| The complete loss of electrical resistance by certain materials when cooled to temperatures near absolute zero. | superconductivity |
| A material with no electrical resistance. | superconductor |
| A potential difference that exists between two points if 1 joule of work is required to move 1 coulomb of charge between them in an electric field | volt |
| Another term for potential difference. | voltage |
| A device used to measure potential difference. | voltmeter |
| SI unit of power. Equals one joule per second. | watt |
