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# Electrical Vocabular

Question | Answer |
---|---|

Amp | An ampere is defined as 6.241*10^18 electrons (1 Coulomb) per second passing through a point in a circuit. |

Voltage | Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light. In brief, voltage = pressure, and it is measured in volts (V). |

Ohm | 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. |

Resistor | a device having a designed resistance to the passage of an electric current. |

Parallel Circuit | A parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. The sum of the currents through each path is equal to the total current that flows from the source. |

Series Circuit | A series circuit is a circuit in which resistors are arranged in a chain, so the current has only one path to take. The current is the same through each resistor. |

Capacitor | A capacitor is a passive two-terminal electronic component that stores electrical energy in an electric field. The effect of a capacitor is known as capacitance. |

Ohm's Law | Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. |

AC current | Alternating current (AC) is an electric current which periodically reverses direction |

DC current | direct current (DC) which flows only in one direction. |

Watt | 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. |

Circuit | a complete and closed path around which a circulating electric current can flow. |

Electrical Ground | In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. |

Conductor | a material or device that conducts or transmits heat, electricity, or sound, especially when regarded in terms of its capacity to do this. |

Insulator | a substance or device which does not readily conduct electricity. |

Joules | the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour. |

Coulomb | the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere. |

Resistance | the degree to which a substance or device opposes the passage of an electric current, causing energy dissipation. Ohm's law resistance (measured in ohms) is equal to the voltage divided by the current. |

Transistor | A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. |

Hertz | the SI unit of frequency, equal to one cycle per second. |