PD from Batteries

• What should you be able to describe by the end of the video?

  What's meant by a battery
• What is the potential difference produced by a single cell mentioned in the video?

  9 volts
• How is a battery defined in physics?

  A battery is two or more cells connected together
• What direction must the cells in a battery be connected?

  In the same direction
• What happens to the potential difference when two cells are connected in series?

  The potential differences of the cells add up
• If two cells each with a potential difference of 9 volts are connected in series, what is the total potential difference?

  18 volts
• If three cells each with a potential difference of 9 volts are connected in series, what is the total potential difference?

  27 volts
• What does a voltmeter measure when two cells are connected in opposite directions?

  0 volts
• Why does the battery have an overall potential difference of zero when one cell is pointing in the wrong direction?

  Because the potential differences of the cells cancel out
• If two cells are pointing in the correct direction and one is pointing in the wrong direction, what is the overall potential difference if each cell has a potential difference of 9 volts?

  9 volts
• What are the key points to remember about batteries and potential difference?

  • A battery consists of two or more cells connected in the same direction.
  • The potential difference of cells in series adds up.
  • Incorrectly oriented cells can cancel out potential differences.
• Where can you find more questions on determining the potential difference of batteries?

  In the vision workbook