Series and Parallel Resistors

DCS Code: 5F20.55 Last Updated: March 27, 2026
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Purpose

Demonstrates Ohm's Law and series/parallel resistance rules with direct voltage and current measurements. Interchangeable resistance boards (identical 150-ohm resistors in different configurations) let students predict and verify equivalent resistance for each arrangement.

Gray Ohm's Law demonstrator panel labeled "OHMS LAW: V=IR" with painted circuit diagram, voltmeter and ammeter, switch, and banana plug connections. Three interchangeable resistance boards displayed alongside: two in parallel, three in parallel, and three in series. A 6V lantern battery is connected with red and black leads.
Figure 1: The Ohm's Law demonstrator with built-in voltmeter and ammeter, plus three interchangeable resistance boards (two in parallel, three in parallel, three in series) using 150-ohm resistors. Powered by a 6V lantern battery.
Demo Apparatus