Gravity Lamp

After reading about this gravity lamp, I am very excited to see that there is new technology that is so incredibly renewable and uses clean energy. This product appears to be incredibly viable, and I am very excited about this new type of renewable energy. The simple technology converts the potential energy of an object into useful energy that may be used for electricity. In order to approximate the weight needed to power the lamp for 30 minutes, I used the equation for potential energy, which may be seen in my work below.
            Energy= mass x gravity x height.
This formula was the basis of my approximation of the objects mass, and ultimately its weight. In order to use this equation, I had to approximate the energy needed to power the object for 30 minutes, or 1800 seconds. To do this, I considered power, because that is the energy needed over a period of time. I was able to calculate power using the formula P=IV, and I approximated the values of the voltage and current, which are listed below under the assumptions. After finding the energy needed in joules, I plugged it into the potential energy formula and approximated the height that the weight would descend from, which is also listed below in the assumptions. From my calculations, I found that the weight would be approximately 20 lbs.