physics June exam

• Power


  Power is the rate at which work is done or it is the rate at which energy is transferred.
• A magnetic field


  A magnetic field is a region in space in which a ferromagnetic material experiences a

  magnetic force.
• A ferromagnetic material


  A ferromagnetic material is one which can form a permanent magnet, or is attracted to a

  magnet.
• The Law of Conservation of Charge


  The Law of Conservation of Charge states that charge cannot be created or destroyed, it

  can only be transferred from one object to another.
• An electrical conductor


  An electrical conductor is a substance through which charge can flow.
• An electrical insulator


  An electrical insulator is a substance through which charge cannot flow.
• Polarization


  The process of separation of charge in a substance
• A vibration


  A vibration is a regular forwards and backwards movement along the same path.
• A pulse


  A pulse is a single disturbance that moves through a medium.
• A transverse pulse


  The disturbance is perpendicular to the direction in which the wave

  travels.
• A longitudinal pulse

  A longitudinal pulse -The disturbance is parallel to the direction in which the wave travels.
• A wave

  A wave is a regular succession of pulses.
• A medium

  A medium is the substance or material through which waves can travel.
• The amplitude

  The amplitude of a pulse (or wave) is the maximum displacement of the particles of the

  medium from their rest position.
• Pulse Speed

  Pulse speed is the distance a pulse travels per unit time.
• The period

  The period of a wave is the time taken for one complete wave to pass a given point.
• The frequency

  The frequency of a wave is the number of waves that pass a point in one second.
• The wavelength

  The wavelength of a wave is the distance between two consecutive points in a wave that are

  in phase.
• A Photon

  A photon is a quantum (energy packet) of light.
• An electromagnetic wave

  An electromagnetic wave is produced when electrical charges accelerate or oscillate.
• Potential difference

  Potential difference is the work done per unit positive charge.
• Current

  Current is the rate of flow of charge.
• One coulomb

  One coulomb is the amount of charge which passes a point in an electric circuit when a current of 1 ampere flows for 1 second
• Emf

  Emf is the total energy supplied per coulomb of charge by the cell.
• Ohms Law

  Ohms Law: Current through a conductor is directly proportional to the potential difference

  across the conductor at constant temperature.
• Resistance

  Resistance is a material's opposition to the flow of electric current.