A string of fifty 15 ohm christmas tree lights are connected in series. one burns out, they all burn out. calculate the total resistance.

The total resistance is 750 [ohm]

Explanation:

To solve this problem we must remember that when we have resistors connected in series, these are added each by the resistance value, in this way we have:

Rt = 15 * 50 = 750 [ohm]

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i just did this and got a 100.