1.   If the heart begins to fibrillate, or beat ineffectively, it generates a powerful electric jolt.

2.   In that process, doctors use electric jolts to restore normal heart rhythm.

3.   The implanted ones work automatically if a serious rhythm abnormality develops, giving an electric jolt if necessary.

4.   Wide copper strips, for instance, which give the enemy a small electric jolt, are effective barriers if you have raised beds or well-separated plants.

5.   Within seconds, a device in his chest put out a powerful electric jolt, knocking his heart back on track.