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# Electricity Grade 9

### Grade 9 science review

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

what is Electrical force? | total charge of an object depends on the difference in protons and electrons |

What is an electrical force field? | All charged objects give off one. |

What is conduction? | The movement of electrons |

If an object is lower on the electrostatic scale that means what? | it gains electrons and becomes negative |

If an object is higher on the electrostatic scale that means what? | it loses electrons and become positive |

a neutral object is charged how? | By being rubbed with another neutral object |

A conductor is? | Allows electrons to flow through easily |

An insulator is? | Tightly bonds electrons. So there is no movement |

Electrical current is? | The speed at which charge flows |

electrical resistance is? | How much an object resists the flow of electrons |

Thicker means? | Less resistance |

Longer means? | More resistance |

Warmer means? | More resistance |

Induction charged separation is? | electrical fields push or pull electrons |

induction is? | charging without contact |

Strength of electrical force depends on: | 1. # of electrons 2. Space between the electrons |

AC/ Alternating current is? | current flowing back and forth |

DC/ Direct current is? | current flowing in 1 direction |

PVI? | P=Watts V=Volts I=Amps |

EPT? | E=Joules P=Watts T=Seconds |

Electrical potential difference is? | The amount of energy needed to move a charged particle |

KWH= | Watts divided by 1000 x Hours used |

electricity cost= | Usage x Cost of electricity |

Efficiency of electricity= | Energy out divided by energy in x 100% |

A circuit is? | A loop of electrical current from one power source to another through loads |

Parallel circuit? | Many loads in between |

Series circuit? | Only 1 load |

Parallel A= V= | A=# divided by how many power sources V=Stays the same |

Series A= V= | A=Stays the same V=# divided by how many power sources |

Primary Cell is? | Not re-chargeable |

Secondary cell is? | Re-Chargeable |

Created by:
pinkcheer