Statement 1: It is observed that sometimes a bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

 More current produces more heating effect and hence the filament heats up completely and it glows brighter but it glows dimmer when less current flows through the wire.

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