Build a relay to remotely control other electrical circuits
RN: 11013102 - ELECTRICITY & MAGNETISM > SOLID STATE ELECTRONICS
7 & 8
An electrical relay is a switch which is under the control of another circuit. A classic relay consists of an electromagnet, used to control switches that may either 'open' or 'close' another electrical circuit. There are many reasons for using a relay, but mostly in situations where a small current flow is used to switch on a large current flow, or high voltage which also makes the system safer to use. A classic example of an electrical relay is the system used to start a car. When someone turns an ignition key, the ignition does not interact directly with the car battery. Instead, it activates an electrical relay which passes the signal on so that the car can start. In this science experiment, use a 'relay' to control the activation of two LED's by opening or closing a circuit to control another:
STUFF YOU NEED [MATERIALS]
- INSULATED COPPER WIRE
- 2x 9-VOLT BATTERIES
- 2x 9-VOLT LED’S
- SINGLE THROW SWITCH
- DOUBLE THROW RELAY
- WIRE CUTTERS
- ADULT HELPER
HOW TO PROCEED [PROCEDURE]
- Assemble the 'first circuit' (red) as per the diagram above by connecting a 9-Volt battery to a switch and a relay in series with insulated copper wires and alligator clips.
- ...... NOTE: The last few steps of this science experiment are only contained in the e-book version. Thank you for your support!
WHY IT WORKS [CONCLUSION]
All our science experiments have been tested to work and have a fully explained 'Why it works' section for each science project.
Unfortunately, this part of the science project is only contained in our e-books. To view the 'Why it works' section of the experiment, please view the science e-books at the bottom of the page.
LEARN MORE FACTS
Each science project contained in our e-books has a 'Learn more' section with relevant information and fun additional science facts that are sure to surprise and amaze you!
Unfortunately, this part of the science project is only contained in our e-books. To view the 'Learn more' section of the experiment, please view the science e-books at the bottom of the page.
Our science project e-books contain all the scientific terms relevant to a particular project at the bottom of each of the science experiments.
Don't know what some of the terms mean? Learn more about the scientific terms used in this science experiment by visiting our interactive and comprehensive Science Glossary
OUR E-BOOK PRODUCTS
If you like this science project, please consider purchasing one of our science project e-books.
This science project is contained in all of the following Experiland e-books: