Difference between of echo and reverberation
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Initially they are connected in parallel, so they have the same voltage V=120 V at their ends. Therefore we can use Ohm's law to calculate the resistance of each appliance:
When they are connected in series, they are crossed by the same current I. The equivalent resistance of the circuit in this case is
, so we can use Ohm's law for the entire circuit to find the current in the circuit:
When they are connected in series, they are crossed by the same current I. The equivalent resistance of the circuit in this case is