Circuits and currents

• What's is current?

  The rate of flow of charge (e.g.electrons) around a circuit
• When will current flow? (What 2 things needeed)

  If circuit is complete and if there's a potential differencr
• What is the potential difference

  Work done(or energy transferred) by the charge. It's the driving force that pushes the charge around
• -| ■- what is this

  Cell
• -■ ---|■- what is this

  Battery
• -□- what is this

  Fixed resistor
• -○~○- what is this

  Power supply
• What does power supply do

  Current can change direction
• What is thiz symbol

  Switch

  
• What is this symbol

  Bulb/filament lamp

  
• What is this sybmol

  Fuse

  
• What symbol is this

  LED (Light emiting diode)

  
• What's the difference between variable and fixed resistor

  Variable an change resistance
• What's this symbol

  Variable resistor

  
• What does ammeter and voltmeter measure

  Ammeter measures current, voltmeter measures pid
• What is this symbol

  Ammeter

  
• What is this symbol

  Diod (only allows current to flow one way)

  
• What's this symbol

  Voltmeter

  
• What is this symbol

  LDR (Light dependent resistor)

  
• What symbol is this

  Motor

  
• What symbol is this

  D.c power supply (electricity goes on direction)

  
• What symbol is this

  Thermistor (resistance changes with temp)

  
• What is the current in metals?


  Flow of electrons
• What is electrical current?


  Rate of flow of charge
• Doubling the potential difference doubles what?


  Current flowing through it