(a) Example of a resistive circuit 80–90% of our students can consistently make qualitatively correct predictions about. (b) Example of a multiple battery circuit 95% of our students can make qualitatively correct predictions about.
(a) Single-loop circuit consisting of a battery, a switch, a bulb, and a capacitor; (b) corresponding circuit with a second battery instead of a charged capacitor.
Single-loop circuit consisting of two batteries, a switch, a bulb, and a capacitor.
Circuit used to post-test RC series circuits: (a) Initial circuit; (c) middle battery removed; (d) middle battery in reverse orientation. The circuit used by Thacker et al. is shown in (b); 9 1 and 2 are ammeters.
(a) Circuit consisting of two batteries, a switch, two bulbs, and a capacitor in parallel with one of the bulbs; (b) corresponding circuit where the charged capacitor has been replaced with a battery.
Circuit consisting of two batteries, a switch, two pieces of Nichrome wire, and a capacitor, used to investigate the RC time of a circuit.
Circuits used in the post-test question on circuits with a capacitor parallel to a resistor.
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