circuits

• lamp

  
• ammeter

  
• ohmic conductors have constant resistance
• the symbol for potential difference is V
• the symbol for current is A
• potential difference(V) = current(A) x resistance
• current is the flow of electrons
• current can only flow if there is a source of potential difference
• resistance is anything that slows down the flow
• greater the resistance the smaller the current
• current can only flow through a diode in one direction