National Grid Demonstration
Product Code : EL-EE-10843
Quick Answer: National Grid Demonstration shows the advantages of distributing power at high voltage: a mounted bulb glows brightly through the high voltage connection and only dimly through the low voltage connection.
Last updated: October 2026
Key Features
- Two step up/down transformers convert 12 V ac from a school power supply to 115 V (nominal)
- Transmission line connects to the low or high voltage connectors, supported by two pylons
- Interlock enables the high voltage once the transmission line is connected to the high voltage connector
- Two sockets measure the high voltage via internal resistors that divide it to a safe level
- Touch proof connectors at both ends of the transmission line
- Detailed manual with step by step instructions
Technical Specifications
| Specification | Value |
|---|---|
| Input | 12 V ac from a school power supply |
| Transmission voltage | 115 V (nominal) |
| Transformers | Two step up/down |
| Pylons | Two |
About This Product
With an a.c. voltmeter and ammeter, input and output power can be measured and the power lost found for both connections, and simple measurements confirm that the transmission line resistance is the same for low and high voltage. The demonstration is designed to prevent access to hazardous voltages and is for student use under supervision. The manual also discusses other losses that can occur in the system.
Frequently Asked Questions
Q1. What measurements can be made?
Using an a.c. voltmeter and ammeter, input and output power can be measured and the power lost found for the low and high voltage connections.
Q2. How is the high voltage protected?
An interlock enables the high voltage once the transmission line is connected to the high voltage connector, and the design prevents access to hazardous voltages.
Related: Electricity & Electromagnetism, BEK Digital Voltmeter, BEK Digital Ammeter, Digital Multimeter.
For a quotation on the National Grid Demonstration, contact School Equipments India.
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