Join batteries, bulbs, resistors, switches, ammeters and voltmeters end to end on a grid. Once the loop is closed the current flows: an arrow shows its direction through every piece, the meters read it, and every bulb glows with the power it takes.
Put two bulbs in series and they share the voltage and glow dimly; put them in parallel and each takes the whole voltage. Give the battery an internal resistance, open a switch or short the battery, and every value follows at once.
Join batteries, bulbs, resistors and meters end to end, watch the current flow and the bulbs light, then save the circuit as SVG or PNG. The tool needs JavaScript, because the currents are worked out in your browser.