School learnersTrace a mechanismExample · 1 question · 2 min

Electric Bell Troubleshooter

Trace the feedback cycle in an electric bell and find the step that has stopped.

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The electromagnet pulls the armature, but the hammer never returns. Which part is most likely stuck?

The battery is too weak, so the bell needs a stronger battery.The spring is stuck, so the armature cannot return and close the contact again.

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Ask what force should move the hammer after the electromagnet switches off.

About this activity

What you practise: Follow a repeating causal chain and diagnose a failure from the last successful state.

A hand-written example with a fixed sequence. It shows what working on a Klarisma activity feels like; your own activities follow your goals and material.

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The electromagnet pulls the armature, but the hammer never returns. Which part is most likely stuck? The bell's cycle in six steps. Steps 1 to 4 run as normal: current flows, the magnet pulls, the contact opens, the magnet lets go. At step 5 the hammer stays at the magnet, so step 6 does not happen. The magnet does pull the armature, so battery and wires work. Then the contact opens, the current stops and the magnet lets go. Now the spring has to pull the armature back. If the hammer stays at the magnet, the spring is stuck: the contact does not close again and the cycle stops.