1·Researchers have discovered that there's enough power in living trees to run an electric circuit.
研究人员发现，活树上的能量足以使电路运转。
2·The separate electrons travel only slowly along the wire, at about one inch a minute, but they all start to move together immediately the electric circuit is complete.
这些的电子仅仅沿着电线作缓慢移动，每分钟约走一英寸左右。然而，只要电路一接通它们便一齐开始行动。
3·Electromagnetic induction: when a conductor of a closed electric circuit move cutting the magnetic induction lines, the conductor produces current.
电磁感应现象：闭合电路的一部分导体在磁场里做切隔磁感线运动时，导体中就产生电流的现象。
4·The prerequisite is a good knowledge of electric circuit fundamentals.
先决条件是对电路的基本内容要有好的了解。
5·The power consumed in an electric circuit is measured in watts or kilowatts.
电路里消耗的功率是以瓦或千瓦来计量的。