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We assume=Im cos(t+a)i=Im cos(ot+B) The phase angle by which the voltage leads

Example 1: If 0=4v2 cos\tV, Z=2/600Q2 Find p(t)and P. Solution:

《电路》（英文版）9-1 Instantaneous power

The phasor diagram is a name given to a sketch in the complex plane of the phasor voltages and currents throughout a specific circuit

8-2 Superposition, source transformation and Thevenin's theorem Superposition:

8-1 Nodal, mesh and loop analysis Nodal analysis:

We define the ratio of the phasor voltage to the phasor current as impedance

一、万用表的使用 二、钳形电流表使用 三、兆欧表使用 四、常用仪器仪表

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