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# electricity

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

What is the unit of measure for current? | Amperes (or Amps) |

What is the unit of measure for voltage? | Volts |

What is the unit of measure for resistance? | Ohms |

Give an example of a good conductor. | Metal (copper, aluminum, gold, silver) |

Give an example of a good insulator. | Plastic, rubber, wood, air, glass |

What function does a switch typically perform? | Opens or closes a circuit |

What is a series circuit? | An electric circuit with a SINGLE path. |

What is a parallel circuit? | An electric circuit with MULTIPLE paths. |

What function does a "Battery Cell" perform? | It provides energy for an electrical circuit. |

What function does a "resistor" perform? | It slows down the flow of electrons in a circuit. |

What function does a "diode" perform? | It allows current to only flow in one direction. |

What function does a "Light Emitting Diode" perform? | It allows current to only flow in one direction, and lights up in the correct direction. |

What function does a "Variable resistor" perform? | A variable resistor is a potentiometer with only two connecting wires instead of three. It allows the resistance to change. |

What does LED stand for? | Light emitting diode |

What is an electical circuit? | A loop of conducting material that allows electrons to flow. |

What is an open circuit? | A circuit is open if the electron flow is stopped. For example, by a switch. |

What is a closed circuit? | A circuit is closed if the electrons flow. |

What is a short circuit? | A circuit where current does not flow through any components. |

What is voltage? | Measure of how much "potential energy" exists to move electrons from one point to another in a circuit. |

What is current? | Electrons flowing between two points. |

What is resistance? | A slowing of the flow of electrons. |

If the voltage is constant and the resistance increases, what happens to the current? | The current decreases. (I = V/R) |

If the voltage is constant and the current increases, what happens to the resistance? | The resistance decreases. (R = V/I) |

If the current is constant and the resistance increases, what happens to the voltage? | The voltage increases. (V = I*R) |

If the current is constant and the voltage increases, what happens to the resistance? | The resistance increases. (R = V/I) |

If the resistance is constant and the voltage increases, what happens to the current? | The current increases. (I = V/R) |

If the resistance is constant and the current increases, what happens to the voltage? | The voltage increases. (V = I*R) |

When resistors are connected in PARALLEL, will the total resistance be LESS THAN or GREATER THAN any of the individual resistors? | LESS THAN. |

When resistors are connected in SERIES, will the total resistance be LESS THAN or GREATER THAN any of the individual resistors? | GREATER THAN. |

If two lamps are connected in SERIES, what will happen to the brightness of each lamp compared to only having one lamp? | The lamps will be dimmer (less bright). |

If two lamps are connected in PARALLEL, what will happen to the brightness of each lamp compared to only having one lamp? | The lamps will be the same brightness. |

Created by:
simonpatel
on 2014-06-28