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Heaters or coils used singly, in series and in parallel on the same supply: heat or time

This type of question, asked 2 times: 29 Jun 2022, 11 Apr 2023. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    29 Jun 2022

    21
    Two coils require 20 minutes and 60 minutes respectively to produce same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce same amount of heat by the combination of coils, will be ____\_\_\_\_ min.

  2. Question 2

    11 Apr 2023

    7
    Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:

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