Electricity Vison math notes

• Quantities


  • Charge
  • Current
  • Voltage
  • Energy
  • Resistance
• Charge (Q)


  Amount of charged particles
• Current (I)


  Rate of flow of charge
• Voltage (V)


  • Electromotive force (EMF) = amount of energy supplied to unit charge to go through the whole circuit
  • Potential difference (PD) = energy spent by unit charge to go through part of the circuit
• Energy (E)


  Amount of energy supplied to per unit work charge
• Resistance (R)


  • Opposition to current flow
  • Depends on length, cross-section area, temperature, material
• Experiment with circuit


  1. Switch circuit every two minutes

  2. Run components with different materials, different resistance
• Parallel circuit


  • Total current is sum of branch currents
  • Voltage is same for all branches
  • Total resistance is smaller than any individual resistance
• Series circuit


  • Current is same throughout the whole circuit
  • Voltage is split up among the resistors
  • Total resistance is greater than any individual resistor