Mar 20, 2014 · Heat is measured in joules because it represents energy transfer, which is consistent with the work-energy principle where work done (force over distance) translates into energy changes. James Prescott Joule's experiments in the 19th century demonstrated the conversion of mechanical energy into heat, establishing this relationship. Heat is …

Oct 2, 2006 · When deflating a tire filled with helium, two theories emerge regarding temperature changes: one suggests it will cool due to adiabatic expansion, while the other posits it will warm up due to the Joule-Thomson effect. The first theory argues that as helium escapes, it performs work against atmospheric pressure, leading to cooling. Conversely, the second theory claims …

Mar 2, 2012 · Then 1 volt means 1 joule per coulomb; 2 volts mean 2 joules per coulomb, and 5 volts mean 5 joules per coulomb. But what is meant by 2 or 5 volts? If one coulomb contains a set amount of electrons, how can one coulomb have more energy or potential to do work than another coulomb? What is different?

Feb 2, 2016 · A Joule Thief can boost voltage but may not be efficient enough to recover significant energy, especially if used continuously. Low input boost converters are available and can operate at lower voltages, but their effectiveness varies based on specific requirements.

Jan 21, 2015 · A joule, on the other hand, is the unit of energy or work, representing the work done by a one-newton force over a one-meter distance. Understanding these units in the context of real-world applications, such as the weight of water in a bucket exerting pressure on its base, helps clarify their significance.

Aug 28, 2009 · The user is seeking tabulations for the Joule-Thomson (J-T) coefficient and enthalpy tables for air, particularly at high pressures, to support their calculations.

Feb 17, 2015 · The discussion revolves around the relationship between different units of the gas constant, specifically Joules and L*atm. Patrick expresses confusion about why these units are closely related and seeks a conceptual understanding rather than just formulas. Participants clarify that L*atm can represent work done by a gas expanding against a pressure, which can …

Mar 2, 2015 · The discussion revolves around building a Joule thief circuit for a school project, with a focus on calculating the number of turns around the ferrite core to ensure the LED lights up. The circuit requires a minimum voltage of 2.0V for the LED, while the available battery voltage is only 1.5V. Participants emphasize the importance of understanding the relationship between …

Jul 9, 2010 · A joule second is a unit of action, representing the least action principle and also serves as the unit of angular momentum, particularly in quantum mechanics. It differs from a joule per second, which indicates energy transfer over time, while a joule second involves multiplying energy by time.

Aug 27, 2012 · The discussion revolves around the entropy changes in a thermally isolated ideal gas during two steps: a quasistatic compression and a subsequent Joule expansion. In the first step, the gas is compressed adiabatically to half its volume, resulting in no entropy change due to the absence of heat exchange. However, in the second step, when the gas expands back to …