Question

The current flowing through a lamp is 1.5 A. It is plugged into a 120-V outlet. What is the resistance of the lamp

Answer 1

Resistance =  (voltage) / (current) =

                       (120 V) / (1.5 A)  =  80 ohms .

Answer 2

Explanation:

According to ohm's law, current flowing through a conductor is directly proportional to the voltage over resistance.

Mathematically,       I = $\frac{V}{R}$

where,     I = current

               V = voltage

                R = resistance

It is given that value of voltage is 120 V and current is 1.5 ampere. Therefore, calculate the resistance as follows.

                            I = $\frac{V}{R}$

or,                         R = $\frac{V}{I}$

                                = $\frac{120 V}{1.5 A}$

                                = 80 volts per ampere

                               = 80 ohms

Hence, resistance of the lamp is 80 ohms.