Look, Capacitor: The more obvious feature is that the capacitor contains a certain solution. In the working environment, the capacitor will heat up and explode to shed the pressure that the body and mind can not bear. Some capacitors with poor quality will be self-destructive and can not be found. There is no shadow of the small firecrackers, leaving only some small pieces of paper. Resistance: After heating and overloading, it will change color or smoke. Of course, the resistor will also blew itself, blow up or fly away from itself.