@Norbert good points. Power usage can only be kept in sensible range when the acceleration pads have limited extend. OTOH Don't bring your laptop with (conventional) hard drive, or pacemaker near magnetic field created by 1m Amps. I once stood near a physics experiment with 1 Tesla magnetic field inside. The stray fields outside the superconducting coil made the keys in my pocket turn - in 5ft distance.