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Here is an example of a simple series circuit. A series circuits will only have one loop with the components all on that loop.
Current will be the same everywhere in a series circuit.
Voltage is shared between each component. The voltage in = voltage out.
The more bulbs that are added to a series circuit the dimmer they get because they share the voltage across them all. If you increase the voltage in from the battery then the bulbs will brighten again.
Series circuits are great because they are very simple to build. The issue is, if you put a few lights into a series circuit they will be really dim and then if one breaks the whole circuit will go out and you won't know which bulb has broken
You might be expected to describe how current changes in series circuits when components are changed and also turn circuit diagrams into real series and parallel circuits, and vice versa.
Use the simulator to become familiar with this and also try watching this video
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