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# basic electricity

Term | Definition |
---|---|

electricity | the flow of |

electrical energy through some conductive material | |

Direct | An electric circuit with current flowing in one direction only is known as a ____ current. |

Alternating | A flow of electric charge that regularly reverses its direction is an ____ current |

capacitor | An electrical device used to store electrical charge. |

load | anything in a circuit that uses electricity |

current | A flow of electric charge. |

fuse | A safety device with a thin metal strip that will melt if too much current passes through a circuit |

circuit | A reusable safety switch that breaks the circuit when the current becomes too high is a ____ breaker |

ampere (A) | SI unit for electric current |

conductor | a material that easily allows the flow of electricity |

insulators | materials that prevent electric charges from flowing through them easily |

battery | a combination of two or more electrochemical cells in a series |

A 3V battery | If you connected two 1.5V cells in series what do you have? |

series | A circuit where there is a single path for the current to travel is known as a ___ circuit. |

same | the current in a series circuit is the throughout the circuit. |

shared | The use of energy in a series circuit with two bulbs will be between the components and they will both be dimmer than if there was one. |

parallel | A circuit where there is more than one path for the current to travel is known as a ___ circuit |

split | The current in a parallel circuit can _____ and re-joined in a parallel circuit |

voltage | The difference in electrical potential energy between two places in a circuit. |

control | Switches are used to ____ the flow of current by making or breaking the circuit. |

Battery | A battery consists of two or more cells |

Cell | A cell is required to push current around a circuit |

Wires | Transfers electrical energy from the battery to load and should always be drawn using straight lines |

Switch | A switch enables the current in a circuit to be turned on or off |

Light bulb | Will convert electrical energy into heat and light when current is flowing |

Ammeter | Measures electric current in amperes (A) and always connected after the batteries in series with the rest the resistors. |

Voltmeter | Measures potential difference in volts (V) |

parallel | The voltmeter must always be connected in ____ with the thing being measured |

voltage | = Amperage (I) x Resistance (R) |

current | I= V/R |

resistance | R=V/I |

Watts | Unit of power |

power | V x I |

Ground | An electrical connection to the earth where the potential energy of the electrons is Zero |

drop | a reduction of electrical energy by an electrical device as current passes through it is known as a voltage ____ |

battery | the total of all the voltage drops across each resistor equals the total voltage across the ____ |

Ohm's | units of resistance |

Resistivity | A material's opposition to the flow of electric current. |

directly | resistance to an electrical current is _________ proportional to the cross sectional area of the conductor (wire) |

Reheostat | an adjustable resistor that allows for manual control of the resistance in a circuit. (dimmer light switch) |

semi-conductor | material that can be made to behave as either a conductor or an insulator of electricity or heat. |

Insulators | materials that keeps energy such a electricity, heat or cold from easily transferring through. |

increases | resistivity _______ with temperature increases |

Superconductivity | a property of a material that has infinite conductivity at very low temperatures, so that charge flows through it without resistance |

Ohm's Law | V=IR |

IR drop | term for the product IR, which specifies the potential drop over a pure resistance R carrying a current |

equivalent resistance | for resistors in a series, is the sum of all the individual resistances |

series | Resistance in a __________ circuit is just the sum of each component |