Magnetic fields, at strength levels appropriate for substantial energy transfer, are easier to generate than equivalent electric fields. (sciencedaily.com)
This increased physical activity need only be of a very low - level to achieve substantial energy expenditure. (philmaffetone.com)
That encouraged others to take up the technique, including a number of universities and larger educational institutions who had substantial energy bills and often quite complex building portfolios of different configurations and ages. (educationbusinessuk.net)