Thursday 4th September
TODAY WE ARE
LEARNING ABOUT
 What are the applications of different types of resistor?
TODAY'S
KEY WORDS ARE
  • R_s_st_r
  • D__d_
  • Th_rm_st_r
  • LDR
  • C_rr_nt
  • _l_ctr_n
  • R_s_st_nc_
  • V_r__bl_  r_s_st_r
  • LDR
  • L_ght  _nt_ns_ty
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    Memory Anchor:

    YOU WILL SHOW
    YOUR LEARNING BY...

    • Super Challenge:

      Stretch:

      Challenge:

    Key Questions:

    1. What happens to the resistance of a filament lamp as the temperature increases?
      • The resistance of a filament lamp increases as the temperature of the filament increases.
    2. A diode will have a very high resistance in which direction?
      • A diode has a very high resistance in the reverse direction.
    3. How does the current through an ohmic conductor (at a constant temperature) behave in relation to the current?
      • The current through an ohmic conductor (at a constant temperature) is directly proportional to the potential difference across the resistor. This means that the resistance remains constant as the current changes.
    4. How could you draw a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component? (include the equation)
      • A circuit which has a battery/Cell with straight lines drawn between components, a component (bulb) with an ammeter in series and a voltmeter parallel to the component (bulb) ensuring all lines do not go throug the components. Using V = I R calculate the resistance by dividing potential difference by the current.
    5. How does the resistance of a diode behave in relation to the current of the component?
      • The resistance of a diode changes with the current through the component in one direction and not allow current to flow in the other direction.
    6. How does the current through a diode behave?
      • The current through a diode flows in one direction only.
    7. How are thermistors used for? Give an example.
      • Thermistors are used in circuits to detect temperature changes, an example is a thermostat.
    8. What happens to the resistance of an LDR as light intensity increases?
      • The resistance of an LDR decreases as light intensity increases.
    9. How are LDRs used in circuits? Oive an example.
      • LDRs are used in circuits to detect light levels, an example is a security light.
    10. What happens to the resistance of a thermistor as the temperature increases?
      • The resistance of a thermistor decreases as the temperature increases.
    11. Why would the resistance of a semiconductor decrease?
      • The resistance of a semicondutor will decrease as the Energy increases due to more charge carriers become freed.