Press Tab to move between parts, terminals and wires. Enter or Space selects an item, and toggles a switch. With an item selected, the arrow keys move it one grid cell, Shift with an arrow moves it four, R rotates it and Delete removes it. Press C on a terminal or a part to choose from a list where a wire goes. Press Escape to let go of the item. Plus and minus zoom.
Choose points from a list
The voltmeter reads from the black probe to the red probe. Drag the probes onto terminals. The ammeter reads a wire or part without touching it.
Circuit
Status
BatteryNone
Current0 A
Power0 W
VoltmeterOff
AmmeterPoint at a wire
Circuit summary, one row for each part
Part
Voltage
Current
Resistance
Power
State
Voltage is the drop across each part. For a battery it is the voltage at its terminals. Current is how much flows through the part. A closed switch has almost no resistance. An open switch or a blown fuse is open.
Connect
Up and Down arrows choose, Enter connects, Escape cancels.
The moving electrons need Canvas, which this browser does not have. Arrows on the wires and the summary table still show every current.
Settings
Show current as
Parts look like
Settings
Appearance
Text size
Contrast
Animation
Reduced animation shows arrows on the wires instead of moving electrons.
Help
Add a part. Drag it from the tray onto the board, or tap it to add it near the middle.
Draw a wire. Drag from a small circle on one part to a circle on another part. Let go on empty space to leave a loose end.
Move and edit. Drag a part to move it. Tap it to change its settings, rotate it, copy it or delete it.
Look around. Drag the empty board to pan. Pinch or use the mouse wheel to zoom. Fit brings the whole circuit back.
Keys. 1 to 6 add a battery, bulb, wire, switch, resistor or fuse. Tab moves between items. Enter selects and toggles a switch. Arrow keys move the selected item (Shift for four cells). R rotates, D duplicates, C connects, Delete removes. Ctrl+Z undoes. Plus, minus and 0 zoom and fit. V voltmeter, A ammeter, T meters, E electrons or conventional, F flow, G grid, N values, S symbols, O examples, H challenges, X splits junctions, U summary, L learn, M menu, P present, Escape closes.