Question

Integrated Concepts. A flashing lamp in a Christmas earring is based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.250 s, during which it produces an average 0.500 W from an average 3.00 V. What energy (J) does it dissipate

Answer 1

Power = (energy) / (time)

0.5 W = (energy) / (0.25 sec)

Multiply each side by (0.25 sec):

Energy = (0.5 W) x (0.25 sec)

Energy = 0.125 W-sec

Energy = 0.125 Joule

We can ignore the Christmas trinket, the RC discharge, the capacitor, the resistor, and the voltage.  We don't need any of them in order to calculate the energy of each flash.  They're only there to confuse us, distract us, and see whether we're paying attention.

Answer 2

Answer:

$Energy=0.125J$

Explanation:

To find

The dissipated Energy

Given data

Duration of flash t=0.250s

Power P=0.500 W

Voltage V=3.00V

As we know that

$Power=\frac{Energy}{time} \\Energy=Power*time\\Energy=0.500W*0.250s\\Energy=0.125J$