click below

click below

Normal Size Small Size show me how

# Physics OCR

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

Coulomb | One coulomb is the amount of charge which flows past a point in a circuit in a time of 1 seconds when current is 1 A |

Kirchhoff's First Law | The sum of the currents entering any point in a circuit is equal to the sum of the currents leaving that same point |

Electrical Current | Flow of Charged Particles |

Potential Difference | Energy transferred per unit charge (V = W/Q) |

Electromotive Force | energy transferred from source/(changed from some form to electrical energy;) per unit charge (to drive charge round a complete circuit) |

Ohm | The ohm is the resistance of a component when a potential difference of 1 volt is produced per ampere of current. |

Ohm's Law | For a metallic conductor at constant temperature, the current in the conductor is directly proportional to the potential difference across its end |

Progressive Force | A progressive Force is one that transfers energy away from its source |

Displacement | Displacement is how far a point on a wave as moved from its undisturbed position. |

Amplitude | The maximum displacement from any point on the wave from its undisturbed position is the amplitude. Amplitude is measured in meters. Greater amplitude means louder sound or rougher sea. |

Wavelength | The distance from any point on a wave to the next exactly similar point (crest to crest) is the wavelength |

Period T | The time taken for one complete oscillation of a point in a wave is called the period T. It is the time taken for a point to move from one particle position and return to that same position (measured in seconds) |

Frequency | The number of oscillations per unit time of a point in a wave is called its frequency F. 1 Hz is one oscillation per second. F = 1/T |

Phase difference | The amount by which one wave lags behind another wave. Measured in degrees or radians. |

Intensity | Intensity is the rate of flow of energy per unit area at right angles to the direction of the wave measured in Wm-2 Intensity = amplitude^2 |