Working-Principle-of-Electrical-Machine-Demonstrator-RVFM-P04029-This-value-for-money-machine-is-ideal-for-demonstrating-in-the-classroom-or-laboratory-the-working-principle-of-the-DC-dynamo-&-single-phase-AC-generator-It-can-also-be-used-to-show-that-mechanical-energy-&-electrical-energy-are-inter-convertible-RVFM-Working-Principle-Of-Electrical-Machine-Demonstator