The filament of a bulb has a resistance of 2.5 ohms. Calculate the current drawn by it if the voltage of the supply is 7.5V
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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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