Electricity

• Charge flow, current and time are linked by the equation


  charge flow = current x time

  
• Unit of charge flow, Q

  coulombs, C
• Unit of current, I

  amps, A
• Unit of time, t

  seconds, s
• Current, potential difference or resistance can be calculated using the equation


  potential difference = current x resistance

  
• Unit of potential difference, V

  volts, V
• Unit of resistance, R

  ohms, Ω
• Direct potential difference induces current to...

  flow in one direction
• Alternating potential difference induces current to...

  alternate the direction of flow
• The colour of the insulation covering the LIVE wire is...

  brown

  
• The colour of the insulation covering the NEUTRAL wire is...

  blue

  
• The colour of the insulation covering the EARTH wire is...


  green & yellow

  
• Power of-, potential difference across- and current through a device are linked by the equation

  power= potential difference x current

  
• Power & resistance of a device, and current through a device are linked by the equation

  
• Unit of power, P

  watts, W
• If an appliance becomes live a person could experience an...

  electric shock
• The amount of energy transferred by electrical work can be calculated using the equation


  energy transferred = power x time

  
• Energy, charge flow and potential difference of a device are linked by the equation

  energy transferred= charge flow x potential difference

  
• Unit of energy transferred, E

  joules, J
• Proton


  Positively charged particle in the nucleus of an atom
• Neutron


  A subatomic particle that has no charge and that is found in the nucleus of an atom
• Ion


  A charged atom
• Electric Field


  The field around charged particles that exerts a non-contact force on other charged particles.
• Non-Contact Force

  A force that one object can apply to another object without touching it
• Line of Force


  The path that a positive charge would follow due to the electric field
• Cell


  Pushes electrons around a complete cicuit

  
• Battery


  Two or more cells

  
• Switch


  Enable the current in a circuit to be turned on or off

  
• Lamp


  Emits light when current passes through it

  
• Diode


  A device that permits current to flow through it in only one direction.

  
• Light-emitting Diode (LED)


  combines the propertied of a diode and a lamp

  
• Ammeter


  A device used to measure current in a circuit

  
• Fixed Resistor

  limits the current in a circuit

  
• Variable Resistor


  Allows current to be varied

  
• Fuse

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

  
• Heater


  Designed to transfer energy from an electric current to heat the surroundings

  
• Voltmeter


  A device used to measure voltage, or electrical potential energy difference

  
• Electrons


  Negatively charged subatomic particles
• Series


  A circuit in which all parts are connected end to end to provide a single path of current.

  
• Potential Difference

  The work done by each Coulomb of charge