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# Current/Resistance

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

What is a series circuit? | Where two bulbs are connected one after another |

What is a parallel circuit? | The current coming from the battery splits up and some goes through each bulb. |

When a bulb blows in a series circuit the circuit ____ | is broken |

When a bulb blows in a parallel circuit the circuit ____ | is complete |

What is the symbol for current? | I |

What is current measured with? | Ammetre |

What is needed for current to flow? | Complete circuit |

What is the unit for voltage? | Volt |

What is the symbol for voltage? | V |

Calculate the resistance of the filament of a car headlamp when 12 V produces a current of 5 | 2.4 |

Why can you not use a piece of wood in a circuit as opposed to a piece of metal? | It is an insulator |

Resistance is measured by what value? | Ohms |

Explain V=IR | Voltage is equal to Current multiplied by resistance |

Explain the graph for V/I | Directionally proportional through the origin |

Explain the graph for I/V | Indirectly proportional |

When a switch is closed in a circuit, what is observed? | Current flows |

Name the instrument used to measure voltage | voltmetre |

State Ohmâ€™s law | I = V/R |

Name an essential component of a circuit | Battery |

What is the unit of current? | Amp |