To learn to produce more power I recommend the following L drill.
1. Place a tee in the handle of a 7 iron.
2. Take your normal stance and posture.
3.Make a 1/2 back swing to a position where your left arm is parallel to the ground. The tee in the handle should point at the target line and form an L with your left arm.
4.Transfer weight forward and rotate through to a position this is the mirror image of the back swing. The tee and your right arm will form the letter L.

The L drill will help you sequence and use your power sources correctly. In time, you will be able to perform these movements in your full swing. This will allow you to achieve your maximum power potential.

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