Topic 2

• What are the colors of the stripes mentioned?

  Green and yellow
• What is the main topic of the study material?

  Mains Electricity
• What happens when insulating materials are rubbed together?

  Electrons are transferred from one material to another
• What does a charged object produce around itself?

  An electric field
• In which direction do electric field lines point?

  From positive to negative
• What charge does a material gain when it receives electrons?

  Negatively charged
• What is the unit of Potential Difference?

  Volts
• How does resistance change with temperature?

  Resistance increases as temperature increases
• In which direction can current flow in a circuit?

  Only in one direction
• What is the relationship between current and Potential Difference?

  Current is directly proportional to Potential Difference
• What is the purpose of the Earth Wire?

  Prevents appliance from becoming live
• What is the function of the Neutral Wire?

  Completes the circuit
• What is the mains electricity voltage?

  230V
• What is the color of the Live Wire?

  Brown
• What are the key components of electricity discussed?

  • Resistors
  • Filament Lamps
  • Diodes
  • Ohmic Conductors
• What are the types of current mentioned?

  • Alternating Current (AC)
  • Direct Current (DC)
• What are the two types of circuit arrangements?

  • Series Circuits
  • Parallel Circuits
• How does voltage change in a step-down transformer?

  Voltage decreases
• How does voltage change in a step-up transformer?

  Voltage increases
• What is the formula for total resistance in series circuits?

  $R =$$R₁ +$$R₂$
• What is the formula for total resistance in parallel circuits?

  $1/R =$$1/R₁ +$$1/R₂$
• What is the formula for power in terms of current and resistance?

  $P =$$I^2 R$
• What is the formula for power in terms of current and voltage?

  $P =$$I V$
• What is the unit of charge?

  Coulombs
• What is the formula for charge in terms of current and time?

  $Q =$$I t$
• What is the unit of resistance?

  Ohms
• What is the unit of current?

  Amps
• What is the unit of power?

  Watts
• What is the formula for energy in terms of power and time?

  $E =$$P t$
• What is the formula for voltage in terms of current and resistance?

  $V =$$I R$
• What is the formula for energy in terms of charge and voltage?

  $E =$$Q V$
• What is the role of the National Grid?

  Transports current at very high voltages
• What happens to current in a parallel circuit?

  Current is split between branches
• What is the relationship of potential difference across each branch in a parallel circuit?

  Potential Difference is the same across each branch
• What is the rate of energy transfer in electrical terms?

  The rate of flow of charge
• What is required for current to flow?

  A source of Potential Difference
• How does resistance affect current flow?

  Resistance determines how hard it is for current to flow
• What is the significance of the direction of current flow in AC?

  Direction of current flow continually changes
• What does higher voltage do in terms of energy loss?

  Higher voltage reduces energy loss
• What is the relationship between current and voltage in a circuit?

  Current flows in one direction