Standard circuit diagrams

• Open switch

  
• Closed switch

  
• This is a lamp

  
• This is a fuse

  
• This is a cell

  
• This is a Voltmeter

  
• This is a battery

  
• This is an ammeter

  
• This is a diode

  
• This is a thermistor

  
• This is a resistor

  
• Variable resistor

  
• This is an LDR (light dependent resistor)

  
• This is an LED (light emitter diode)