User's Manual

®
Model No.EM-8678A Product Description
2
*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 cables 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.
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.
Additional Equipment Recommended for Experiments Information*
PASCO Interface (such as UI-5000 850 Universal Interface) See PASCO web site
PASCO Data Acquisition Software (such as PASCO Capstone) See PASCO web site*
PASPORT Voltage/Current Sensor PS-2115
Power Supply (Low Voltage) See PASCO web site*
Battery holders
Charge
position
Discharge
position
Double-throw
switch
Empty slot
Resistors
Shielded
banana jack
connector
Capacitor,
1.0 farad, 5 volt
Common conductive
pathway
Light bulb holders