| 词条 | Joule's law |
| 释义 | Joule's law electronics in electricity, mathematical description of the rate at which resistance in a circuit converts electric energy into heat energy. The English physicist James Prescott Joule (Joule, James Prescott) discovered in 1840 that the amount of heat per second that develops in a wire carrying a current is proportional to the electrical resistance of the wire and the square of the current. He determined that the heat evolved per second is equivalent to the electric power absorbed, or the power loss. A quantitative form of Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms. |
| 随便看 |
百科全书收录100133条中英文百科知识，基本涵盖了大多数领域的百科知识，是一部内容开放、自由的电子版百科全书。