Electricity

• RESISTANT IN PARALLEL CIRCUIT

  1/R + 1/R
• Resistance in series circuit

  Sum of each resistance and then current = voltage / total resistance
• Total potential difference in series circuit


  Split across compounds
• Total potential difference in parallel circuit

  They are the same
• Current in series


  Same
• Current in parallel


  Split across branches
• Step up transformer


  Goes from low voltage to high voltage so energy can be made with less energy lost
• Step down transformer


  Makes voltage safe for homes decreases it
• Charge is


  Value of electricity flowing in a circuit
• Current is


  Flow of electrons
• Potential difference


  Pushes current around
• Resistance


  Slows down current
• Thermistor


  Used for heating current flows only at certain temps
• LDR


  Street lights and security lights
• Potential difference =


  current x resistance
• Power =


  Current x potential difference
• Charge =


  Current x time
• live wire


  Brown
• Earth wire


  green and yellow
• Neutral wire


  Carries current away is blue
• Energy with Columbus equation

  Energy = coloumbs x potential difference
• Current only flows around circuit if 


  There’s a potential difference
• Resistance 


  Slows down flow of current
• greater the resistance 


  Smaller the current that flows through
• Charge = 


  Current (A) x Time(s)
• Potential difference =


  Current x resistance
• Ohmic conductors are


  Wires or resistors
• In Diodes resistance depends on

  Direction of current , high resistance if reversed
• The resistance of Punic conductors doesn’t 


  Change with current
• Current through ohmic is directly 


  Proportional to potential difference

  
• as current increases (filament)


  temperature of filament increases so resistance increases
• Potential difference measured in

  Amps
• Unit for resistance is

  Ohms
• Electron flow is from the

  Negative to positive terminal
• Mains electricity potential difference and frequency

  230V

  50Hz
• Ammeters set up in

  Series
• Voltmeter set up in

  Parallel
• series circuit current is

  Same at all points
• Conventional current direction flow is from

  Positive to negative terminal
• True or false as temp of thermistor increase so does resistance

  False