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.

Expert Answers
jeew-m eNotes educator| Certified Educator

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