Determination of electronic charge by using a rectifier with power supply and 2 meters (C.R.) Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12270
Indian Lab Suppliers supplies the Determination of electronic charge by using a rectifier with power supply and 2 meters (C.R.) (Product ID: 12270) as part of its electronics engineering lab equipment range. It finds the electronic charge e from the forward characteristic of a point-contact germanium rectifier.
Quick Answer
For forward voltages of a few tenths of a volt the diode current follows the rectifier equation I = I0(eeV/kT − 1), so a graph of log I against V is a straight line whose slope gives e/kT. Students step the built-in 0-500 mV DC (0.5 mA) variable supply, read V on an FET millivoltmeter (100 mV and 200 mV ranges) and I on a DC microammeter (25 µA and 250 µA ranges), then calculate e using the room temperature. Two germanium diodes are fitted, and no other apparatus is required.
Key Specifications
| Parameter | Detail |
|---|---|
| Experiment | log I vs V in forward bias; electronic charge from the rectifier equation |
| Power supply | 0-500 mV DC at 0.5 mA, continuously variable |
| Voltmeter | FET millivoltmeter, 65 mm rectangular, 100 mV and 200 mV ranges |
| Current meter | DC microammeter, 65 mm rectangular, 25 µA and 250 µA ranges |
| Diodes | Two point-contact germanium diodes |
| Mains | 230 V ±10%, 50 Hz AC; ON/OFF switch, fuse and indicator lamp |
| Other apparatus | None required |
Where This Is Used
Used in modern-physics and semiconductor practicals at undergraduate level. Related: Boltzmann Constant Apparatus (Product ID: 12121) and Study of Forbidden Energy Gap with P/S & 1 digital meter (C.R.) (Product ID: 12312). Browse the full Electronics Engineering Lab Equipment range or related Physics Lab Equipment products.
Frequently Asked Questions
Which diode is used?
A point-contact germanium diode; two are provided.
Why is a millivoltmeter used?
The useful linear region of log I vs V lies at low forward voltages, well under 0.5 V.
What else is needed to calculate e?
The room temperature, since the slope of the graph equals e/kT.
Related Categories
Electronics Engineering Lab Equipment · Physics Lab Equipment · Electronics Lab Equipment
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