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# HP 38g Calculator - Creating Aplets in the HP 38g CalculatorAplets

Description
Aplets are interactive lessons designed for HP calculators by educators and students. These interactive lessons have been developed for teachers and students to investigate, explore, and play with mathematical concepts.
The main purpose of an aplet is to promote student-centered learning through exploration and discovery. Aplets can be created for group discussions, cooperative group experiences, and individual investigation. Aplets are designed to control the parameters of the environment where the student is working or to ease the syntax and manipulation required by the calculator.
Reasons for creating aplets
The power of the HP 38g allows the option of saving lessons for future use and transferring them to students to ensure that everybody in the class is "on the same page" while working on a concept. In its simplest form, an aplet can be used to save a set of equations to be investigated. More complex aplets involve programming with input forms, message boxes, graphics objects, and text displays.
Ohm's law and power aplet example
Suppose an aplet was needed to help students explore the relationships among voltage, current, and resistance (the ideas of Ohm's law and power). The idea would be to design the aplet so that the student could choose the appropriate equation to use, enter the known information, and solve for the unknown value.
Creating the Ohm's law and power aplet
To create the Ohm's law and power aplet:
1. Access the APLET LIBRARY by pressing LIB. The HP 38g has six built in aplets: FUNCTION, PARAMETRIC, POLAR, SEQUENCE, and SOLVE (see Figure 1).
Figure : The APLET LIBRARY
2. Highlight SOLVE and press START. The calculator should be in the SYMBOLIC view of the SOLVE APLET (see Figure 2)
Figure : Solve symbolic view
3. Enter the equations for Ohms law, power, and resistors in parallel and series in E1 through E6 (see Figure 2).
4. To save this set of equations as an aplet under a new name, press LIB to return to the APLET LIBRARY.
5. Press SAVE and hold down the A...Z key, enter a new name for the aplet, and press OK (the example is named Ohm's LAW/POWER) (see Figure 3). The new aplet will appear in the library.
Figure : The HP 38g's SAVE APLET screen
To further enhance this aplet, a NOTE and a SKETCH may be added to provide students with instruction guidance, and information. To add a note to this example:
1. Press SHIFT, then NOTE to access the NOTE view of the OHM'S LAW/POWER APLET.
2. Enter the appropriate text message using the A...Z key (see Figure 4).
Figure : NOTE view for the OHM'S POWER / LAW APLET
To add a sketch to the OHM'S POWER/ LAW example:
1. Press SHIFT, then SKETCH to access the SKETCH view.
2. Use the DRAW features to sketch a circuit diagram with a battery and resistor (see Figure 5)
Figure : Circuit diagram sketched with the DRAW features in SKETCH view
3. Use the TEXT features to label the diagram.
##### note:
Additional sketches may be drawn to detail resistors in parallel and series circuits. The OHM'S POWER/LAW APLET is automatically updated to include the note and sketches that have been designed.

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