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1试题与简析试题:小明在观看了宾馆等处的光电烟雾探测器后,自己设计了一只“火灾报警器”(如图1).该报警器由“控制电路”和“工作电路”所组成,其中“控制电路”由光敏电阻R、电磁铁(线圈阻值R0=15Ω)、电源U=6V、开关等组成;“工作电路”由工作电源电铃、导线等组成.小明的设计思想:当光敏电阻接收到的光照减弱到一定程度时,工作电路接通,电铃报警.
1 questions and analysis questions: Xiao Ming after watching the photoelectric smoke detectors in hotels, etc., he designed a “fire alarm” (Figure 1). The alarm by the “control circuit” and “Working circuit” composed of “control circuit” consists of photosensitive resistor R, electromagnet (coil resistance R0=15Ω), power supply U=6V, switch and other components; “working circuit” from the power supply Bell, wire and other components. Xiaoming’s design idea: When the light received by the photoresistor weakened to a certain extent, the working circuit is connected, the bell alarm.