Science 9 – Here is a tool I showed the students to use for analyzing circuits. They color code wires in a circuit according to high (purple) and low (blue) pressure. A wire has equal pressure at all points. In order for a bulb to light, they know there must be a pressure difference across the bulb, because charges move from high pressure to low pressure. Tracing and colour coding the wires lets the students see which bulbs have a pressure difference and which ones don’t. We then quickly checked the circuits in real life to see that they agreed.
Once a person gets more comfortable with looking at circuits and schematics, they can easily identify a short. However, this is a great bridge between what they they’re learning (pressure differences) and what they can do (predict bulbs lighting).