Electricity Experiments You Can Do at Home by Stan Gibilisco

Author:Stan Gibilisco
Language: eng
Format: epub, pdf
Publisher: McGraw-Hill
Published: 2010-03-25T16:00:00+00:00

Wire Up the Transformer

Radio Shack manufactures a step-down transformer designed for portable electronic devices. At the time of writing, this transformer, which Radio Shack calls a power adapter, was part number 273-1690. When plugged into a standard utility AC outlet that supplies 117 volts (V) root-mean-square (RMS), the power adapter produces either 18 or 24 V RMS AC output, depending on the position of a selector switch. For this experiment, you should set this switch to the 18 V position.

Take hold of the power adapter’s output cable. That’s the thin two-wire cord with the round miniature plug (not the thicker cord with the standard utility plug). Be sure that the adapter isn’t connected to any source of power. Cut off the miniature plug, separate the wires at the ends of the cord, and strip 1 inches (in) (2.5 centimeters [cm]) of insulation from each wire. Wrap one wire around terminal I-1 and the other wire around terminal K-1 on the breadboard, as shown in Fig. AC5-1.

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