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Flashcards by Indigo Gray, updated more than 1 year ago

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The equations to know for Combined Science at GCSE level.

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Question | Answer |

Power (electricity) | P = VI power (watts) = potential difference (volts) x current (amps) |

Power (electricity 2) | P = I^2xR power (watts) = current^2 (amps) x resistance (ohms) |

Energy Transferred (power) | E = Pt Energy transferred (joules) = power (watts) x time (seconds) |

Density | p = m/v Density (kg/m^3) = mass (kg) / volume (meters^3) |

1 Energy Transferred (charge) | E = QV Energy transferred (joules) = charge flow (coulombs) x potential difference (volts) |

2 Energy Transferred (change) | E = ItV Energy transferred (joules) = [current (amps) x time (seconds)] x potential difference (volts) |

Weight | W = mg Weight (newtons) = mass (kg) x gravitational field strength (newtons/kg) |

Work Done | W = fd Work done (joules) = force (newtons) x distance (metres) |

Force Applied to Spring | F = ke Force (newtons) = spring constant (newtons/metre) x extension (metre) |

Distance Travelled | S = vt Distance travelled (metres) = speed (metres/second) x time (second) |

Pressure | p = F/A Pressure (newtons/metres^2) = force [normal to surface] (newtons) / area (metres^2) |

Moment of a Force | M = Fd Moment (newton metres) = force [normal to direction of force] (newtons) x distance (metres) |

Acceleration | a = Δv/t Acceleration (metres/second^2) = change in velocity (metres/second) / time (seconds) |

Resultant Force | F = ma Resultant force (newtons) = mass (kg) x acceleration (metres/second^2) |

Momentum | p = mv Momentum (kg m/s) = mass (kg) x velocity (m/s) |

Kinetic Energy | KE = (1/2) m v^2 Kinetic energy (joules) = 1/2 x mass (kg) x velocity^2 (metres/second) |

Gravitational Potential Energy | GPE = mgh GPE (joules) = mass (kg) x gravitational field strength (newtons/kg) x height (metres) |

Power (energy) | P = E/t Power (watts) = energy transferred (joules) / time (seconds) |

Power (work done) | P = W/t Power (watts) = work done (joules) / time (seconds) |

Efficiency (energy) | Efficiency = useful output energy / total input energy |

Efficiency (power) | Efficiency = useful power input / total power output |

Wave Speed | V = fλ Wave speed (metres/second) = frequency (hertz) x wavelength (metres) |

Charge Flow | Q = It Charge flow (coulombs) = current (amps) x time (seconds) |

Potential Difference | V = IR Potential difference (volts) = current (amps) x resistance (ohms) |

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