By removing one light and checking if the other lights are still on or not
Explanation:
- Light bulbs (or other electrical devices) are said to be in series when they are connected one after the other along the same string. In this case, the current flowing throught each bulb is the same, since there is only one branch of the circuit, and therefore, if one light is removed from the circuit, it interrupts the flow of current, and therefore all the other lights will turn off.
- Light bulbs (or other electrical devices) are said to be in parallel when they are connected to the same voltage source in different branches. In this case, the current in the circuit splits into the different branches, so each branch (with its own light bulb) has its own current. The potential difference at the terminal of each light is the same. Therefore in this case, if one light bulb is removed from the circuit, the other light bulbs will continue working, since they are on separate branches, so the current stops flowing only in the branch where the light has been removed.
Therefore, removing one light is enough to determine if the lights are wired in series or in parallel: if they all stop working, they are in series; if only one light stops working, they are in parallel.
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