Question

A toaster is plugged into an 120-volt outlet. If it has a resistance of 460 ohms, how much power does it use?

Answer 1

Answer:31.3W

Explanation: JUST A FORMULA

P = V*V/R = 120*120/460 = 31.3W

Answer 2

the power which is used by the toaster when plugged into 120 V outlet having resistance of 460 ohm, is 31.3 W.

Explanation:

The toaster is given to be plugged into a 120 V outlet. The power it uses can be calculated using the following method,

Given that Voltage V=120 V

Resistance R=460 ohm

As we know that,

$\text { Power }=\text { Voltage } \times \text { Current }$

$\text {And Current}=\frac{\text {Voltage}}{\text {Resistance}}$

$\text { therefore, Power }=\text { Voltage } \times \text { Current }=\text { Voltage } \times \frac{\text { voltage }}{\text { Resistance }}$

$\text { Power }=\frac{\text { Voltage }^{2}}{\text { Resistance }}$

Substituting the values, we get,  

$\text { Power }=\frac{120 \times 120}{460}=\frac{14400}{460}=31.3 \mathrm{Watts}$

Therefore, the power which is used by the toaster when plugged into 120 V outlet having resistance of 460 ohm, is 31.3 W.