Which will be brighter?
Identical lamps each of resistance are connected in parallel to a battery and a resistance in three different ways , and as shown.
In which case the total brightness produced is maximum?
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1 solution
Consider the general case of a resistive load connected to a voltage source with an internal resistance. The load power is maximized when the load resistance is equal to the source resistance. Since the resistance of a single lamp is twice the resistance of the source, two lamps in parallel will satisfy this condition.