When testing DC voltage, where should the red test lead be connected?

When testing DC voltage, the red test lead should be connected to the positive polarity test point. This is because the red lead is typically designated as the positive lead in DC voltage measurements. Connecting it to the positive terminal allows for the correct measurement of voltage potential relative to the negative terminal, which is usually where the black lead is connected.

In a standard DC circuit, the positive terminal (or point) has a higher potential compared to the negative terminal. To obtain an accurate voltage reading, the measurement must be taken from the higher potential side (positive) to the lower (negative). Therefore, positioning the red test lead at the positive test point is essential for obtaining the correct and meaningful voltage reading.