The key design factor in a VAV system is the control of. the supplied air. The terminal unit should be sized to. take advantage of as much of its potential capacity as. possible. Without this fundamental consideration, the. customer has not received the best value for their VAV. system design.
The amperage rating on the DC motor is not the amperage the treadmill will be using from your wall outlet. Most treadmills only need 10-12 amps from the wall (or less), so a 15 amp circuit is fine, regardless of the rating on the motor. Just look at the amperage rating on the treadmill to see what your wall outlet needs to supply. #2 see #1. #3 Current is always lost in the form of heat when used to power a device. Be it in the motor, the electronics or even the line supplying the current.
Treadmills allow you to walk, jog or run, depending on your fitness goals. The faster you go, the more calories you burn, and the more impact you create in your workouts. Your physical condition -- more than your age -- should guide you as you select treadmill speeds. Younger children will be less concerned with impact than seniors, and will be better able to withstand the effects of higher speeds. Start slow and build your ability to use a treadmill at higher speeds as you improve your physical condition.