Electricity Y8

• Which of these materials are a good conductor?

  1. plastic
  2. copper
  3. carbon
  4. rubber

  copper and carbon
• Where would you place the voltmeter in a circuit?

  Parallel to the circuit or component
• True or False: The split between the voltage is not always even

  True
• What does the battery do in a circuit?

  Provides energy to the components in the circuit
• In a series circuit, the current decreases depending on how many componenets you have
• You place the ammeter in series to the circuit
• You place the voltmeter in parallel to the circuit
• How does voltage change in a parallel circuit

  It remains the same
• What does an ammeter measure?

  Current
• What does an ammeter measure in?

  amps
• What does a voltmeter measure in?

  volts
• What is resistance measured in?

  Ohms (Ω)
• The current in a series circuit is the same
• True or false: A higher current could make electrons more likely to collide with eachother

  True
• voltage = current × resistance
• The equation " voltage = current × resistance " is known as what law?

  Ohm's law
• What does a higher resistance mean regarding current?

  Lower current
• True or false: Removing a cell and increasing resistance will NOT cause a decrease in current

  False
• What is the voltage of a neutral wire in a plug?

  0V
• What does the neutral wire do in a plug?

  Complete the circuit
• What is the voltage of an earth wire in a plug?

  0V
• What does an earth wire do?

  It is a safety wire and it's needed for earth appliances with a metal case
• What will happen to the fuse if it goes over the limit?

  It will blow
• What is the voltage of the live wire?

  230V
• What does the live wire carry?

  A current that alternates between a positive and negative voltage
• In a parallel circuit the voltage is the same across loops
• A cell stores chemical energy
• What is the correct term for voltage?

  Potential difference
• What is potential difference?

  The energy transferred between electrons
• Eletrical work is done by the electrons as they pass through the component
• What is the unit for energy?

  joules
• An electron is negatively charged
• What is charge?


  The quantity of electrons flowing at any one point
• When the free outer electrons flow in a metal wire, they collide with the vibrating ions
• When the free outer electrons collide with the vibrating ions, this slows down the electrons
•  If the potential difference increases and the current stays the same, the resistance increases
• What is the total voltage?

  The sum of all the voltages
• Dangers of electricity:

  • getting burnt
  • fuse blowing
  • shock
  • eletrocution
• How can you prevent getting burnt by a circuit?

  Turn off the circuit when you aren't using it
• How can you prevent getting eletric shock?

  Keep water away from the circuit