Question

The current in a lamp is 0.5 amps when plugged into a standard 110 V wall outlet. What is the resistance of the lamp when it is plugged into the standard wall outlet? *

Answer 1

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

Mathematically, I =

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 =

or, R =

=

= 80 volts per ampere

= 80 ohms

Hence, resistance of the lamp is 80 ohms.