Power

Electricity only flows around a complete loop: out of the battery's + end, along wires and through things, and back into its other end. While it flows, little yellow dots run along the wires, so you can see it go.

	Block	What it does	✋ USE
	Battery	Pushes electricity out of its + end. The + is on top (or on the right, when wires come from the sides). Two batteries in a row push twice as hard.	—
	Wire	Carries electricity. It joins every wire, gold block and part next to it.	—
	Switch	A gap in the loop that you can close. Open (tipped up) = no electricity. Closed (flat) = it flows.	open ↔ closed
	Lamp	Lights up when electricity flows through it: brighter with more. Lit:	—
	Buzzer	Hums while electricity flows through it: louder with more.	—
	Clicker	A switch that flips itself: on for one second, off for one second. Put note blocks in its loop for music.	—

Parts turn to face their wires. A lamp, switch, buzzer or battery with wires on its left and right connects sideways; with wires above and below, it connects up and down. The little gray metal ends show which way it's facing. Wires count first: three or more lamps packed side by side between a wire above and a wire below all face the wires, and all light.

Which way a battery pushes. A battery's + end is always its top or its right, and it can't be turned round. Two batteries on opposite sides of a loop push against each other, so nothing flows: put them next to each other in a row instead, and they push twice as hard.

Short circuit! If a battery's + end is wired straight back to its other end with nothing in between, it sparks and smokes (). Real batteries get dangerously hot when you do that, so never try it with a real one. Nothing breaks here: fix the wiring and it stops. It doesn't matter how long the wire is. A motor or generator is not plain wire: its coil holds the current back like a lamp does, so a battery wired straight across one doesn't spark. It spins it (see ⚙️ Gears). And two batteries side by side lighting lots of lamps do not spark: that isn't a short circuit, each battery is just sharing the work.