a cell of potential difference 6V is connected to a bulb. the bulb draws 0.5 A current while glowing find the resistance of the bulb
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Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship, I = V/R.
Rewriting this relation we arrive at R=
I
V
=
1.2A
6V
=5ohms.
Hence the resistance of the filament of the bulb is 5 ohms.
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