When a light bulb is connected to a 4.5V battery, a current of 0.16A passes through the bulb filament. Calculate the resistance of the filament.

1 Answer

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jeew-m | College Teacher | (Level 1) Educator Emeritus

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According to Ohm's law the current (I) of a circuit , Voltage (V) and Resistance (R) is combined as follows.

`V = IR`


According our question;

`V = 4.5`

`I = 0.16`


`V = IR`

`R = V/I`

`R = 4.5/0.16`

`R = 28.125`


So the resistance of the filament is 28.125 ohms