Physics

• the network of transformers and transmission cables that transfers electrical power from power stations to consumers is called the National Grid
• How does step-up transformers make the National Grid efficient?

  • Potential difference increases
  • Current is reduced
  • Less/low energy loss to surroundings
• What component affects resistance and temperature?

  Thermistor
• Straight line graph = linear relationship
• When a liquid -> gas - more particles
• LED/diode only allows current through one direction. If it doesn't work, you should switch the cable connections to LED or battery.
• mA -> A = /1000
• When an atom emits light, electrons in the atom fall to a lower energy level
• switch (open)

  
• cell

  
• battery

  
• diode

  
• resistor

  
• variable resistor

  
• LED - light emitting diode

  
• lamp

  
• fuse

  
• voltmeter

  
• ammeter

  
• thermistor

  
• LDR - Light Dependent Resistor