Series and parallel The components are connected end-to-end, one after the other.They make a simple loop for the current to flow roundIf one bulb ‘blows’ it breaks the whole circuit and all the bulbs go out. Parallel CircuitsThe components are connected side by side.The current has a choice of routesIf one bulb ‘blows’ there is still be a complete circuit to the other bulb so it stays alight. What to do next... STILE (Online) Printable More Information? Back to Week 4 Next lesson