The test light is an electric lamp connected with one or two insulated wire leads.For line voltage mains work the lamp is usually a small neon lamp connected in series with an appropriate ballast resistor.
what is difference between series and parallel connection
In a series circuit the sum of the voltages consumed by each individual resistance is equal to the source voltage. Components connected in parallel are connected along multiple paths so that the current can split up; the same voltage is applied to each component.

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