Boojho made the circuit given in Fig. and observed that the bulb did not glow. On Paheli’s suggestion, he added one more cell in the circuit. The bulb now glows. Explain.


The bulb did not initially glow because one of the cells could not produce enough voltage to cause the current to glow the bulb. When a second cell is connected to the circuit, the voltage across the circuit doubles, allowing the current to be increased. The filament of the bulb is sufficiently heated by this current, and the bulb glows.

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