19,879
edits
Changes
→Key Stage 4
[[Electromagnet]]s increase in [[temperature]] as they are used.
|}
===Applications===
{| class="wikitable"
|-
|[[File:RelayDiagram1.png|center|300px]]
|[[File:RelayDiagram2.png|center|300px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2"|When the switch is closed the [[electromagnet]] pulls the [[Iron]] armature towards it. This causes the the two large electrical contacts to touch. When the [[switch]] is open the [[electromagnet]] turns off and the contacts separate.
This is used for safety reasons so that a [[switch]] can be used to operate a [[circuit]] with a very large [[Electrical Current|current]] indirectly.
|}
{| class="wikitable"
|-
|[[File:BellDiagram1.png|center|300px]]
|[[File:BellDiagram2.png|center|300px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2"|When the [[switch]] is closed the [[electromagnet]] pulls the [[Iron]] armature towards it. This causes the a [[metal]] arm to bend and the striker to hit the bell. When the arm bends the [[circuit]] is broken and the [[electromagnet]] turns off. This allows the striker to move back away from the bell, where electrical contact is made and the process repeats.
|}