PASCO Specialty & Mfg. EM-8627 User's Manual
Contents
1. connector on the circuit board e Connect the cord from the negative terminal on the power supply to the negative Power connector on the circuit board CAUTION When using an external power supply do not exceed a voltage of 3 volts for the bulbs or 5 volts for the capacitor Also always connect the positive lead from an external power supply to a positive connector and the negative cord to a designated negative connector on the circuit board Reversing positive and negative cord connec tions from an external power source may permanently damage the capacitor WARNING To avoid shock never place water or a wet hand in the path of the circuit Always con nect an external power supply to a properly grounded electrical outlet Do not get the board or any of its components wet Do not place the board near water Follow standard electrical safety precau tions and treat the Charge Discharge Circuit like any other conductor To Connect a PS 2115 PASPORT Voltage Current Sensor to the Charge Discharge Circuit e To measure voltage Plug the positive red voltage lead from the sensor into a positive connector on the circuit board Plug the negative black voltage lead into a negative connector on the circuit board Note The connection of the leads from the sensor must be in parallel with a component of the circuit e To measure current Plug banana plug patch cords into the positive and negative banana plug ports2. on the Voltage Current Sensor Connect the Voltage Current Sensor in series with the Charge Discharge Cir cuit For example plug the patch cord from the positive banana plug port on the sensor into the Power connector on the Charge Discharge Circuit board Plug the other patch cord from the sensor into the positive connector for the capacitor To Connect Other Devices to the Charge Discharge Circuit Two empty slot springs are available for adding or testing other types of components with the circuit board Suggested Applications e Demonstrating Ohm s Law the relationship of current to voltage and resistance in a direct current circuit e Comparing the voltage current curve for an ohmic resistor to the voltage current curve for a light bulb which may be nonlinear e Measuring the charge discharge of the capacitor e Comparing battery discharge rates for different types of rechargeable batteries not included 4 PASC Ce Model No EM 8678A Equipment Setup Appendix A Specifications Item Information Capacitor 1 0 farad 5 volt maximum Resistors 10 ohm 33 ohm and 100 ohm 5 volt maximum Light Bulbs 3 volt maximum Board 18 3 by 13 centimeters composed of fiberglass Appendix B Typical Circuit Diagram The Charge Discharge Circuit board was designed to allow the user flexibility in measurement and experimenta tion The lower portion of the board contains a built in copper circuit with a la
3. to control the path of the electrical current through the components on the Charge Discharge Circuit For the Ohm s Law circuit for example when the switch lever is in the Charge Position energy from the bat teries can be routed to the capacitor Moving the lever to the Discharge Position allows the capacitor to dis charge energy through a resistor or light bulb or other component that is connected For example if a light bulb is connected as the energy dissipates as heat and light the bulb slowly becomes dim Connecting External Devices to the Charge Discharge Circuit The Charge Discharge Circuit was designed to be used with PASCO sensors meters and external power sup plies Connecting an external device requires a set of banana plug patch cords 1 e at least one positive and one negative banana patch cord such as the SE 7123 Banana Plug Patch Cords set of 8 The board has three positive three negative and nine neutral unlabeled shrouded banana jack connectors The connectors with the label are for inserting positive leads and the connectors with the label are for inserting negative leads The neutral connectors are for connecting either positive or negative leads depending on your setup TEIH 3 Charge Discharge Circuit Equipment Setup To Connect an External Power Supply to the Charge Discharge Circuit e Connect the cord from the positive terminal on the power supply to the positive Power
4. Instruction Sheet 012 14176A Charge Discharge Circuit EM 8678A LEYNSYCXO Charge Discharge Circuit EM 8678A Light Bulbs 14 GE mini screw 3 EM 8627 pack of 25 Order EM 8627 for replacement bulbs See the PASCO catalog or web site at www pasco com for more information AA Batteries 2 PlI 6601 pack of 4 Banana Plug Patch Cords SE 7123 set of 8 AAA Batteries can also be used in the EM 8678A Charge Discharge Circuit D To O 1 916 786 3800 800 772 8700 support pasco com Www pasco com Model No EM 8678A Product Description Additional Equipment Recommended for Experiments PASCO Interface such as UI 5000 850 Universal Interface see PASCO web site PASPORT Voltage Current Sensor PS 2115 PASCO Data Acquisition Software such as PASCO Capstone See PASCO web site Power Supply Low Voltage See PASCO web site See the PASCO web site at www pasco com Product Description The EM 8678A Charge Discharge Circuit can be used for the study of Ohm s Law battery and capacitor charge discharge rates or for various other experiments in electronics The Charge Discharge Circuit is included in the EX 9949 and EX 9953 Ohm s Law Experiments Mounted to the circuit board are three types of resistors 10 33 and 100 ohm a double throw switch three light bulb holders and a 1 0 farad F capacitor The board also includes 15 shrouded banana jack connectors for attaching leads and cab
5. cquer finish The upper half of the board provides multiple connection points for various setup options Note The board does not contain a series parallel circuit Diagram Typical Setup for Demonstrating Ohm s Law To PASCO Note The appearance of the Interface Charge Discharge Circuit may vary slightly By allowing the batteries to charge a capacitor connected to a resistor this setup may be used to study Ohm s law in real time that is seeing the current and voltage dynamically change When the switch is moved to the charge position the battery charges the capacitor When the switch is moved to the discharge position the capac itor discharges through the resistor In the PASCO data acquisition software plot the voltage vs the current during Discharge for each separate run The slope of the graph is resistance To see the effect of varying the resistance on the voltage discharge rate the student can switch the lead connections to different resistors Using the Data Acquisition Software e For example in the PASCO Capstone software click the Hardware Setup icon in the Tools palette to open the Hardware Setup panel Confirm that the Voltage Current Sensor icon appears with the interface s icon e Create a graph display Select Voltage for the vertical axis and Current for the horizontal axis The slope of this graph will be the resistance e Move the switch to the Charge posit
6. egistered trademarks of PASCO scientific in the United States and or in other countries For more information visit www pasco com legal Product End of Life Disposal Instructions This electronic product is subject to disposal and recycling regulations that vary by country and region It is your responsibility to recycle your electronic equipment per your local environmental laws and regulations to ensure that it will be recycled in a manner that protects human health and the environment To find out where you can drop off your waste equipment for recycling please contact your local waste recycle disposal service or the place where you pur chased the product The European Union WEEE Waste Electronic and Electrical Equipment symbol to the right and on the product or its packaging indicates that this product must not be disposed of in a standard waste container 6 PASC Ce
7. ing you will need a PASPORT Voltage Current Sensor and a PASCO computer inter face with data acquisition software such as the UI 5000 850 Universal Interface and UI 5400 PASCO Cap stone NOTE If you use the PASCO Capstone software you can also use the Science Workshop CI 6503 Voltage Sensor and the ScienceWorkshop CI 6556 Current Sensor with either the UI 5100 850 Universal Interface or the CI 7650 750 Science Workshop Interface See Appendix B for a typical experiment setup option Inserting Replacing the Batteries When inserting the batteries follow the orientation for the posi tive and negative ends of the batteries shown on the battery holders A set of AA alkaline batteries can be ordered from PASCO PI 6601 pack of 4 Inserting batteries into the battery holders For Ohm s law studies alkaline batteries or re rechargeable batteries can be used Inserting Replacing the Light Bulbs A set of three 3 volt light bulbs comes with the Charge Discharge Circuit To remove a burnt out bulb turn the bulb counterclockwise and lift out To replace a bulb insert the bulb into one of the plastic slots slot A B or C and turn the bulb clockwise until it fits tightly into the slot For the bulb to light the bulb tip must maintain con tact with the metal piece in the slot CAUTION To avoid overloading the circuit do not use bulbs greater than a 3 volt capacity Using the Double Throw Switch The double throw switch is used
8. ion and let the capacitor charge for 20 to 30 seconds e Next move the switch to the Discharge position and click Record to begin collecting data e When the current reaches zero click Stop and move the switch to the middle position PASC Ce 5 Charge Discharge Circuit Equipment Setup Sample Data V 1 6 in ear 1 2 0 8 Voltage V 0 4 0 0 0 00 0 04 0 08 0 12 Current A Technical Support For assistance with any PASCO product contact PASCO at Address PASCO scientific Web Www pasco com 10101 Foothills Blvd Roseville CA 95747 7100 Phone 1 916 786 3800 worldwide Email support pasco com 800 772 8700 U S For the latest information about the Charge Discharge Circuit visit the PASCO web site at www pasco com and enter EM 8678A in the Search window Limited Warranty For a description of the product warranty see the PASCO catalog Copyright The PASCO scientific Instruction Sheet is copyrighted with all rights reserved Permission is granted to non profit educational institutions for reproduction of any part of this manual providing the reproductions are used only in their laboratories and classrooms and are not sold for profit Reproduction under any other circumstances without the written consent of PASCO scientific is prohibited Trademarks PASCO PASCO Cap stone PASPORT SPARK Science Learning System SPARK SLS SPARKvue and ScienceWorkshop are trademarks or r
9. les and one empty slot for connecting any other devices The circuit board also has holders for two AA or AAA batteries which would provide the main power supply to the circuit The resistors and light bulbs connect to a common ground negative terminal through the conductive electrical pathway on the lower half of the board Battery holders a IP O i 5 v lt ee I y V E Shielded E e al N banana jack AA OR AAA AA OR AAA connector Le BATTERES BATTERES ex CHARGE DISCHARGE CIRCUIT _ Ii Charge position Discharge position Le vl suss a Light bulb holders Common conductive Resistors Empty slot Double throw pathway switch Auxiliary power supplies sensors and other external devices can also be connected A set of short banana patch cords is recommended for making connections between or into other leads A Voltage Current Sensor can be connected to measure voltage and current in the circuit and discharge rates for the capacitor PASC Ce 2 Model No EM 8678A Equipment Setup Using the Charge Discharge Circuit with a sensor such as the Voltage Current Sensor requires a PASCO com puter interface and data acquisition software such as the UI 5000 850 Universal Interface and UI 5400 PASCO Capstone Equipment Setup You will need two AA or AAA batteries not included three 14 GE Mini Light Bulbs included and a set of banana plug patch cords not included For real time data record
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