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# unit 1.1 partA

### vocabulary

Term | Definition | Example Sentence |
---|---|---|

Breadboard | A circuit board for wiring temporary circuits, usually used for prototypes or laboratory work. | He needed a breadboard for his prototype. |

Conventional Current | the direction of current flow associate with positive charge in motion. The current flow direction is from a positive to negative potential, which is in the opposite direction of electron flow. | She knew what conventional current was. |

Current | a movement of electrical charges around a closed path or circuit. | He checked the current. |

Digital | A way of representing a physical quantity by series of binary numbers. A digital representation can have only specific discrete values. | My sister got me a digital watch. |

Digital Multi-mater | a piece of test equipment used to measure voltage, current, and resistance in an electronic circuit. | The worker needed the digital multi-mater to measure the voltage. |

Engineering notation | A floating point system in which numbers are expressed as products consisting of a number greater than one multiplied by an appropriate power of ten that is some multiple of three. | She didn't really understand engineering notation. |

Kirchhoff's current law | The algebraic sum of all curents into and out of any branch point in a circuit must equal zero. | Marcos understood Kirchhoof's currents law. |

Kirchhoff's Voltage Law | The algebraic sum of all voltages around any closed path must equal zero. | Kim knew that in Kirchhoof's voltage law any closed path had to equal to zero. |

LED | Light-emitting diode. An electronic devise that conducts current in one direction only and illuminates when its conducting. | |

ohm | unit of resistence. Value of one ohm allow current of one ampere with potential of one volt. | Students in physics know ohm unit. |

ohm's law | in electric circuits, I=V/R. | Ohm's law is easy to undersand. |

Parallel circuit | one that has two or more branches for separete current from one voltage source. | Emy explained to her classroom what a parallel circuit was. |

Resistance | Opposition to current. Unit is the ohm. | |

resistor color code | coding system of colored stripes on a resistor to indicate the resistor's value and tolerance. | He founded hard to dp the resistor color code. |

scientific Notation | Numbers entered as a number from one to ten multiplied by a power of ten. | He knew what scientific notation |

Series Circuit | one that has only one path current. | Noah new that the series circuit only one path. |

SI Notation | Abbrevation of system International, a system of practical units based on the meter,kiligram, second, ampere, Kelvin, mole and candela. | |

Solder | Metallic alloy of tin and lead that is used to join two metal surface. | Many workers use solders. |

Soldering | Process of joining two metallic surfaces to make an electrical contact by melting solder across them. | He constructers use soldering. |

Soldering Iron | Tool with an interial heating element used to heat surfaces being soldered to the point where the solder becomes molten. | |

Analog | A way of representing some physical quantity, such as temperature or velocity, by a proportional continuous voltage or current. an analog voltage or current can have any value within a defined range. | He didn't really understand what analog was. |