The idea is that a mains device under test is connected in series with a light bulb of a suitable wattage to let through enough current to run the device in normal operation, but to light up and ...

A 6-V battery powers a circuit with parallel branches on a board. Several wires and light bulbs plug into the board to make various series and parallel circuits. The brightness of the bulbs changes ...

In a series circuit, the current passes from the ... It's a simple string of miniature light bulbs, with some wiring inside that connects everything together. Holiday light companies use various ...