Voltage, Current & Resistance
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Created by:
Solanoap10880 on May 15, 2010
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52 terms
Terms | Definitions |
|---|---|
 Current moves through a conductor at the speed of _____. | LIGHT: Approximately 186,000 miles per second. |
| Current in an electric circuit is measured with an instrument called an _____. | AMMETER |
| When current is measured, the ammeter is connected so that it becomes part of the _____. | CIRCUIT |
| When you connect a D-C ammeter into a circuit you should always observe the correct _____. | POLARITY |
| The opposition to current flow in an electrical circuit is called _____. | RESISTANCE |
| The law that defines the relationship between current, voltage and resistance is called _____ Law. | OHM'S LAW: If any two electrical characteristics are known, you can determine the third with Ohm's Law. |
| According to Ohm's Law, the current in any circuit is _____ proportional to the applied voltage. |  DIRECTLY |
| Two meters that can measure electrical resistance are the _____ and _____. | OHMMETER & MEGOHMMETER: The ohmmeter measures circuit resistance; the megohmmeter measures the high resistance of insulation. |
| Ammeter | A meter used to measure electric current. It is connected as part of a circuit. |
| Ampere | The unit of measurement of electric current. One ampere is one coulomb per second. |
| Closed circuit | A complete path allowing current to flow. |
| Conductor | A material that gives up free electrons and offers only slight opposition to current flow. |
| Current | The movement of free electrons in a material. |
| Electromotive Force (emf) | The force that causes electrons to move through a conductor. |
| Electron Current | The current from a negative charge to a positive charge. |
| Free Electrons | Electrons in the outer orbits of an atom that can easily be forced out of their orbits. |
| High Voltage | A term that normally implies a voltage higher than 600 volts. |
| Insulator | A material that does not give up free electrons easily and offers opposition to current flow. |
| Kilohm | 1.000 ohms. Usually written 1k omega. |
| Megohm | 1.000.000 ohms. Written 1M omega or 1 meg omega. |
| Megohmmeter | An insulation-resistance tester. Consisting of a high-range ohmmeter and a high-voltage generator. |
| Ohm | The basic unit of resistance measure. One ohm is equal to the resistance that allows 1 ampere of current to flow when an emf of 1 volt is applied. |
| Ohmmeter | A meter for directly measuring the resistive component of an electrical circuit. |
| Omega | Greek letter for ohm. |
| Open circuit | A circuit with a break or open path that stops current flow. |
| Voltage | The term most frequently used to express the difference of potential between two charges or between two points of a circuit. |
| Voltmeter | A meter that is connected across the line to measure the potential difference (voltage) between two points. |
| What term besides voltage is used to indicate electrical pressure? | POTENTIAL |
| Which of the following provides the electrical potential for an electrical system. | GENERATOR |
| To measure electrical potential, you should use a/an... | VOLTMETER |
| How should a voltmeter be connected in a circuit to measure voltage? | Across or in parallel with the potential points being measured. |
| Without a given potential, how do free electrons in a conductor constantly move? | From negative to positive. |
| The instrument that measure electrical current is the... | AMMETER |
| An ammeter must be connected in the circuit in such a way that... | All current flows through it. |
| Resistance | The property of a circuit which limits, opposes or resists the flow of electricity through it. |
| The resistance of a conductor is measured in a unit called... | OHM: Named after the German physicist and mathematician George Simon Ohm. |
| The unit for measuring circuit resistance is the... | OHM |
| Ohm's Law is used to determine relationships between... | VOLTAGE, CURRENT & RESISTANCE |
| What two meters are used to measure electrical resistance? | MEGOHMMETER & OHMMETER |
| When the current (I) and resistance (R) are known, the voltage (E) can be found by the formula. |  E = I x R |
| (P) or (W) means? | Power |
| (V) or (E) means? | Voltage |
| (I) means? | Current, Amp or Amperage |
| (R) means? | Ohms or Resistance |
| When two points that have an electrical potential difference are joined by a conductor, _____ _____ results. | CURRENT FLOW |
| The terms voltage and potential are both used to indicate the electrical _____ in a system. | PRESSURE |
| In an electrical system, the potential is provided by a storage _____, a mechanically driven _____, or a dry cell. | BATTERY; GENERATOR |
| The instrument used to measure difference in electrical potential is called a _____. | VOLTMETER |
| An electrical current is produced when an applied voltage sets the free _____ of a material in motion. | ELECTRONS |
| Materials that have few free electrons are called _____. | INSULATORS: Mica, porcelain, glass, bakelite and silicone are good insulating materials. |
| If a battery is connected to teh two ends of a wire, the electrons movement in the wire is toward the _____ battery terminal. | POSITIVE |
| The electron movement along the conductor of a circuit is the same everywhere, provided the applied _____ remains constant. | VOLTAGE |
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