If a light bulb uses 0.4 amperes of current at a voltage of 1.8 volts, the formula to find r is , and the resistance of the bulb is ohms. nextreset

Answer : The resistance of the bulb is 4.5 ohms

Solution :

Using ohm's law,

where,

V = applied voltage = 1.8 volts

I = current = 0.4 amperes

R = resistance

Now put all the given values in the above formula, we get the resistance of the bulb.

Therefore, the resistance of the bulb is 4.5 ohms

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