Time to apply what you know. Fourth graders reason through trickier scenarios: a balloon gaining electrons from a wool sweater, a series circuit with two bulbs when the switch opens, and why lightning rods on tall buildings are made of metal instead of plastic. Each multiple-choice question forces a real prediction.

You will also name what kind of material blocks current, explain how a grounding wire protects a house, and identify which everyday action around frayed cords is genuinely unsafe. These problems push past memorizing terms and into the kind of cause-and-effect reasoning real scientists and electricians use to keep circuits working safely.