# Articles

## Power Conversion

The main principle of Practical Method is:
• Separation of yin and yang
on which all cencepts and actions are based.

The major concept of Practical Method is:
• Indirect power
There are two categories of actions:
1. Lock the two ends, move the middle.
2. Lock the middle, move the two ends.
In order to have indirect power, actions go through two classes of power conversions:
1. T class
2. Y class
These classes can be further broken down into four types:
1. TR2L - When an action is rotational, the result is linear.
• In Fig. 1, when rotating on the AC line, energy goes out from A to B and D. The result is tangential to the AC rotation at B (going into the page).
• The direction of the rotation on the AC line can be reversed, causing the tangential move at B to be reversed.
• Category: Lock the two ends, move the middle.
• Example: Spinning a rattle drum.
2. TL2R- When an action is linear, the result is rotational.
• In Fig. 2, when moving B around A while A is not moving, the energy goes from B to A. The result is rotation on the AC line
• The direction of how B moves around A can be reversed, causing the direction of the rotation on the AC line to be reversed.
• Category: Lock the middle, move the two ends..
• Example: Turning an auger
3. YH2V - When an action is horizontal, the result is vertical.
• In Fig. 3, when B and D move towards each other, the energy will go torwards A. The result is the AC line moving downwards.
• B and D can move away from each other instead, causing the the AC line to move upwards.
• Category: Lock the middle, move the two ends.
• Example: Squeezing a tooth paste
4. YV2H - When an action is vertical, the result is horizontal.
• In Fig. 4, when AC line moves upwards, the energy will go from A to B and D. The result is B and D will move away from each other.
• The AC line can move downwards instead, causing B and D to come together from each other.
• Category: Lock the two ends, move the middle.
• Example: Open and closing an umbrella
Actions as described in T and Y classes of power conversions can be combined.
1. Rotating one gear that is attached to another is TR2L + TL2R.
2. Opening an umbrella while turning it is TR2L + YV2H.
3. Unscrewing a cork from a wine bottle is TL2R + YV2H.
Looking the T bar from the top is a simple lever between B and D with A being the pivot.

DAB in the Y bar form a triangle as described in:
http://practicalmethod.com/2014/07/triangle_double_lock_single_lock/.
Source: https://practicalmethod.com/?p=67807