Components

• Symbol for a fuse

  
• What does a light emitting diode do?

  An LED will emit light when current flows through it, and only allow current to flow in one direction
• What does an ammeter do

  Measure the current in a circuit
• Where should an ammeter be placed

  In series with the components
• What does a voltmeter do

  Measure the potential difference
• Where should the voltmeter be placed

  In parallel across the component you’re interested in
• Thermistor

  A resistor whose resistance decreases as temperature increases
• What is a thermistor used for

  Measure the temperature
• Graph for thermistor

  
• What is a light dependant resistor

  A resistor whose resistance decreases as light intensity increases
• What is an LDR used for

  Measuring light intensity
• Graph for a light-dependant resistor

  
• Variable resistor

  Resistor whose resistance can easily be changed by moving a slider
• Fixed resistor

  Has a fixed resistance that cannot be changed
• Symbol for light emitting diode

  
• Symbol for variable resistor

  
• Symbol for thermistor

  
• Symbol for LDR