感应电动势有感生电动势和动生电动势两种,前者由穿过回路的磁感应强度发生变化引起,用ε=ΔΦ/Δt计算;后者由导体做切割磁感线运动引起,一般用ε=Blv计算.下面分析几道感应电动势与复杂电路相结合的综合题,由此阐明感应电动势的求法,并巩固含源电路的欧姆定律等知识. There are two kinds of induced electromotive force: induced electromotive force and dynamic electromotive force. The former is caused by the change of the magnetic induction intensity through the circuit, and is calculated by ε=ΔΦ/Δt; the latter is caused by the magnetic induction line motion by the conductor, generally ε=Blv. Calculations. The following analysis of a few questions combined with the combination of induced electromotive force and complex circuits will clarify the method for the induction of electromotive force and consolidate knowledge of Ohm’s law with source circuits.