Series and parallel circuits

In the picture

1. 1The single series loop: current stays the same at every point around the loop.
2. 2A bulb in the series row: it carries the same current as the other bulb and lights dimly.
3. 3The fork in the parallel circuit: the current splits into two branch currents.
4. 4The junction in the parallel circuit: the branch currents meet and add back together.

Examples

• A string of old fairy lights where one broken bulb can stop the whole series string.
• Home lights on separate branches so one room can be switched on while another stays off.

Quiz: Series and parallel circuits (Age 13)

1. 1

   In a series circuit with one single loop, what is true about the current?

   • The current gets weaker after every component.
   • The current is the same at every point around the loop.
   • The current splits into separate branches.
2. 2

   In a parallel circuit, what happens to the current at the fork?

   • The current disappears at the fork and returns at the junction.
   • The current splits into the branches.
   • The current stays as one current and does not split.
3. 3

   At the junction where parallel branches meet, what happens to the branch currents?

   • The branch currents stay completely separate.
   • The branch currents join and add back together.
   • The branch currents cancel each other out to zero.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.