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It is thus the responsibility of the physics instructor to introduce his/her students to a variety of electric circuit models that will
enable those students encountering circuits for the first time to come up with their own coherent mental picture of current flow in an electric circuit. Electric circuit analogs might prove helpful in this endeavor. Photograph of the Glitter Electric Circuit Analog
(GECA) showing the pump (battery), the valve (switch),the thin tube (light bulb), a flow meter (ammeter), and two pressure sensors that indicate the pressure difference across the thin tube. Not shown is the valve that shuts off the filler/drain tube at the bottom right of the circuit. The Glitter Electric Circuit Analog shown in Fig. 1 is a water circuit analog using parts that are readily
available from plumbing suppliers. 3 We use ¾-in clear plastic tubing (e.g., Tygon tubing) and matching clear plastic elbows, not so much as to reveal the fluid within the tubing but rather the many pieces of glitter suspended within this fluid. We represent the equivalent of the light bulb in the water circuit with a piece of thin (¼-in) Tygon tubing that is looped once, resembling the shape of the light bulb filament in the light bulb symbol (cf. Fig. 2). The counterpart to the electric switch is represented by a quarter-turn ball valve. The electric circuit needs to be a complete loop. The electric wire must go from one terminal of the battery to the light bulb, and then from the other side of the light bulb back to the battery. The flow starts instantaneously. At essentially the
same time when we flip a light switch, the light comes on. Similarly, at the same time we open the valve in the GECA, glitter pieces start to flow everywhere in the circuit, including the “light bulb tube.”
Tags : light bulb filament, clear plastic tubing, plumbing suppliers, circuit models, pressure sensors, water circuit, drain tube, thin tube, tube light, electric switch, quarter turn, ammeter, ball valve, mental picture, flow meter
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