Ideal switch

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In electronics engineering, ideal switch is the term to describe the condition for a switch that:

• has no current limit during its ON state
• has infinity resistance during its OFF state
• has no voltage drop across the switch during its ON state
• has no voltage limit during its OFF state
• has zero rise time and fall time during its state changings
• switches only once without "bouncing" between on and off positions

In real life, the normal switches are called practical switch which have some losses and limitations.