Physics

• INVESTIGATING ADDING RESISTORS IN SERIES:

  • have at least four identical resistors
  • make a circuit with one resistor, a battery (with it’s pd recorded) and an ammeter
  • measure the current and then calculate the resistance with the pre-recorded pd.
  • add another resistor and repeat this step until all four have been added.
  • PLOT A GRAPH (should find increasing resistance, decreases current)
• INVESTIGATE RESISTORS IN PARALLEL:

  • add ammeter, resistor, battery, into a circuit
  • Measure current in circuit with ammeter, and calculate the total resistance with pd of battery.
  • Then add the next resistor in parallel to first, and repeat step 3 until all have been added.
  • PLOT A GRAPH: should show the total current increases, while the total resistance decreases.
  • more resistors added, the smaller overall resistance is.
• What are the first steps to “the extension of a spring” practical?

  • set up a clamp stand with a clamp hang the spring from the clamp

  use a second clamp and boss to fix a (half) metre ruler alongside the spring
• What should you do after you fix a metre ruler alongside the spring?

  record the metre ruler reading that is level with the bottom of the spring

  • hang a 2 N weight from the bottom of the spring
  • record the new position of the bottom of the spring
• What are the final steps of the extension of a spring experiment?

  • calculate the extension of the spring
  • measure the extension of the spring
  • add further weights to the spring so the force increases 2 N at a time up to 10 N
  • for each new force record the position of the bottom of the spring and calculate / measure the extension