| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
|
The resistance of a filament lamp increases as the temperature of the filament increases. (Required practical activity 4) |
|
What happens to the resistance of a filament lamp as the temperature increases? |
|
|
|
The applications of thermistors in circuits eg a thermostat is required. |
|
|
|
|
|
Students should be able to explain the design and use of a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component |
|
|
|
|
|
The diode has a very high resistance in the reverse direction. |
|
A diode will have a very high resistance in which direction? |
|
|
|
Students should be able to explain the design and use of a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component |
|
|
|
|
|
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. (Required practical activity 4) |
|
How does the current through an ohmic conductor (at a constant temperature) behave in relation to the current? |
|
|
|
Students should be able to explain the design and use of a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component |
|
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) Draw and compare circuits that measure resistance. Highlighting the importance of placing the voltmeter in parallel and ammeter in series.
EW: Justify what type of resistor should be used in a street lamp. |
|
|
|
The resistance of components such as lamps, diodes, thermistors and LDRs is not constant; it changes with the current through the component. (Required practical activity 4) |
|
How does the resistance of a diode behave in relation to the current of the component? Draw and compare circuits that measure resistance. Highlighting the importance of placing the voltmeter in parallel and ammeter in series.
EW: Justify what type of resistor should be used in
Circuit of lamp, diode, thermistor or LDR |
|
|
|
The current through a diode flows in one direction only. |
|
How does the current through a diode behave? Draw graphs of current against voltage for LDR, Diode, thermistor and filament lamp. |
|
|
|
The applications of thermistors in circuits eg a thermostat is required. |
|
How are thermistors used for? Give an example. Investigate the effect of temperature and light intensity on thermisters and LDRs |
|
|
|
The resistance of an LDR decreases as light intensity increases. (Investigation) |
|
What happens to the resistance of an LDR as light intensity increases? LDR light intensity practical |
|
|
|
The application of LDRs in circuits eg switching lights on when it gets
dark is required. |
|
How are LDRs used in circuits? Oive an example. |
|
|
|
Students should be able to explain the design and use of a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component |
|
|
|
|
|
The resistance of a thermistor decreases as the temperature increases. (Investigation) |
|
What happens to the resistance of a thermistor as the temperature increases? |
|
|
|
[The resistance of a semicondutor decreases as energy increases as more charge carriers become freed] |
|
Why would the resistance of a semiconductor decrease? |
|
|