Hands-On-Physics
MECHANICS

Core
Project

- Aircart Electrical System -
Complicated electrical systems can be built from combinations of a few different kinds of parts, so these systems are often pictured in symbolic form. The standard symbols for three different kinds of electrical parts are pictured below. A cell (battery) puts electrical energy into a circuit, a resistor changes electrical energy to some other form, and a switch turns the energy flow on and off. A double-throw switch lets you choose between two electrical pathways.

Circuit Elements



Figure C9
Electrical symbols

When electrical elements are connected (usually with wire) one after the other in a logical line, they are said to be connected in series. If this string of parts is joined to form a closed loop it is called an electrical circuit. You can refresh your knowledge of series circuits by going to the HOP Electronics unit. The circuit for the Aircart motor is shown below. The motor chosen for this aircart runs on 3 volts, so two 1.5 volt batteries are attached in series with the motor. For convenience, a switch may be added. The single-pole-double-throw switch in your kit is not necessary, but it is cheap. The unused contact could be used to include a "low speed" for the motor. Suggestions: Please solder the electrical connections. If you need to learn how to solder, make a pair of clip-leads. Clip-leads are useful when you are experimenting with circuits.

Circuit for Aircart Motor



Figure C10
Series circuit


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