Circuit Components

• This is a circuit symbol of an open switch

  
• This is a circuit symbol of a closed switch

  
• This is a battery

  
• What circuit symbol is this?

  A bulb

  
• What does an Ammeter do?

  Measures current
• A voltmeter measures the potential difference ( the voltage )
• This is a fixed resistor

  
• What does a fixed resistor do?

  Allows a specific amount of current and voltage through
• A variable resistor changes the current to change the resistance
• The circuit component, Thermistor changes resistance when the temperature changes
• What does the diode allow?

  Only allows one current to flow in one direction
• The light dependant resistor changes light when the resistance changes
• Resistance slows the flow of electrons in a circuit
• What does it mean if a circuit has high resistance?

  • low current
  • low energy
  • Higher potential difference
• If the resistance increases, what 2 things will happen?

  The potential difference increases and the current/energy decreases
• What is the OMHS law?

  Current is directly proportional to potential difference as long as the temperature is constant. If a component obeys OHMS law, we call it an Ohmic conductor
• Thermistor - Increase the temperature, you decrease the resistance, so you have more current and energy

  
• Light dependant resistor - Increases the light, you decrease the resistance so you have more current and energy

  
• What does the circuit component, fuse do?


  Melts if the current gets too high
• What circuit component is this? variable resistor

  
• What circuit component Symbol is this?

  A cell

  
• What circuit component is this?

  A bulb

  
• What circuit component is this?

  A fuse

  
• What circuit component is this?

  A bulb

  
• What circuit component is this?

  Diode

  
• What circuit component is this?

  the light dependent resistor (LDR)

  
• What circuit component is this?

  Ammeter

  
• What circuit component is this?

  Voltmeter

  
• What circuit component is this?

  Thermistor