Question

You and a friend are studying late at night. There are three 110 W light bulbs and a radio with an internal resistance of 56.0 Ω plugged into the living room electrical outlets. You decide to have a break and have a snack, turning on the pop-corn machine that draws 7.00 A. How much electrical power are you using? Data: Assume the electric company provide you with 110 V potential difference.

Answer 1

Answer:

The total electrical power we are using is: 1316 W.

Explanation:

Using the ohm´s law $V=I*R$ and the formula for calculate the electrical power, we can find the total electrical power that we are using. First we need to find each electrical power that is using every single component, so the radio power is:$I=\frac{V}{R}=\frac{110 (v)}{56(ohms)}=1.96(A)$, so the radio power is: $P=I*V=1.96(A)*110(v)=216(W)$, then we find the pop-corn machine power as: $P=I*V=7(A)*110(v)=770(W)$ and finally there are three light bulbs of 110(W) so: P=3*110(W)=330(W) and the total electrical power is the adding up every single power so that: P=330(W)+770(W)+216(W)=1316(W).