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# Physics Revision

Voltage | Pushes the current around the circuit |

Current | Flow of electricity |

Resistance | Anything that resists or lowers current |

National Grid | The system of power stations, cables, pylons and transformers that supply electricity to consumers |

Adding components increases ... and lowers the ... | Resistance Current |

Resistance graphs are... | Straight lines |

Bulb graphs are... | Curved |

There is a curve because... | As the bulb gets warmer the resistance increases, and the currents begging to level off |

The line is straight because... | Voltage and current are proportional to each other, the resistance stays constant |

Power | The rate of using energy |

What do step up transformers do? | Increases the voltage and decreases the current to decrease the amount of heat energy wasted |

What do step down transformers do? | They lower the voltage and increase the current to make it safe for consumers |

To convert from kV to V you... | x1000 |

To convert form MV to V you... | x1000000 |

Series Circuit Rules | Voltage is shared between each component V1=V2+V3 Current is the same at each part of the circuit A1=A2=A3 |

Parallel Circuit Rules | Voltage is the same everywhere Current is split between each branch |