Question

what current flows through a hair dryer plugged into a 120 volt circuit if it has a resistance of 25 ohms

Answer 1

Current is 4.8 A.

Step-by-step explanation:

We know that, from Ohm's law that for a current carrying conductor, the potential difference across it is directly proportional to the current flowing through it, keeping the physical properties same. From Ohm's law:

`V=IR`, where,

`V\rightarrow \textrm{Voltage across the conductor}\\I\rightarrow \textrm{Current across the conductor}\\R\rightarrow \textrm{Resistance of the conductor}`

Now, plug in 120 for
`V`, 25 for
`R` and solve for
`I`. This gives,

`120=25I\\I=(120)/(25)=4.8\ A`

Therefore, the current flowing through the hair dryer is 4.8 A.