component characteristics

• wires, filament lamps and most other components follow the general rule that as their temperature increases their resistance also increases - this is because the particles get in the way of the electrons more when the object is warmer
• The perfect wire vs real life wires

  always conducts more current when we increase the potential difference

  
• the perfect wire vs real life wires?

  real wire, resistors and filament lamps tend to only let some current pas, even when the p.d increases

  
• ohmic resistor vs non-ohmic resistor?

  Ohmic resistor: Follows Ohm's law and has a constant resistance. Non-ohmic resistor: Does not follow Ohm's law and has a variable resistance