Electric

 Good question — let’s break it down clearly:

1. A switch by itself

If an electric switch is ON but nothing is connected (for example, a wall switch that isn’t powering any load), it consumes essentially zero electricity. A simple mechanical switch is just a piece of conductive metal making or breaking contact — no significant current flows unless there’s a device drawing power.

If the switch is connected to an appliance but the appliance is OFF (say, a lamp switched off at the lamp but left plugged in), then some modern devices might still draw a tiny “standby” or “phantom” load, but the switch itself isn’t the one using energy.

2. An iPhone rapid charger

An iPhone fast charger (20W USB-C) uses about:

• Up to ~20 watts when actually charging the phone at full speed.
• Much less (<0.1–0.5 watts) when plugged into the wall but with no phone connected (standby mode).

3. Comparison

• Switch ON, no load → ~0 W (≈0% compared to a charger actually charging).
• Charger in use → ~20 W.
• Charger idle but plugged in → ~0.1–0.5 W, still much higher than a bare switch.

✅ So: a simple switch left ON consumes negligible electricity, while an iPhone rapid charger actively in use consumes about 20 watts — orders of magnitude higher.

Do you want me to also calculate what that means in terms of monthly cost on your electricity bill (say, per kWh)?