Learn how to test a transformer: insulation resistance, TTR, winding resistance, polarity, continuity, and dielectric checks.

The metal shed of the driving school was scorched by the midday sun. I stared at the oil stain on the ground and heard Coach Li shouting, "Next, Wang Xiulan, come over to test the battery voltage!" ...

During a traffic jam at noon on the highway, kids in the back seat kicking the seatback is a scene all too familiar to middle ...