Electricity flows only when there is a path joined in a ring. Break it in one place and it stops. Depending on how the path is joined, a bulb gets brighter, or a nail becomes a magnet.
I clipped this and that between a bulb and a battery
A board to adjust
What makes the light come on?
How shall we join two batteries?
A board to adjust
Joined in a line, or side by side: what differs?
I wound wire round a nail and connected a battery
A board to adjust
How many paper clips will stick? Change the number of turns and the number of batteries.
From here electricity gets numbers
What comes next in middle school · electricity and magnetism
The push, the amount that flows, how much it is held back
It is the bulb you lit above. Electricity is easier if you compare it to water. How high the water is piled is the voltage, how narrow the pipe is, the resistance, and the amount of water flowing, the current.
The bulb from above
A board to adjust
Change the voltage and the resistance. Watch the amount that flows and the brightness of the bulb.
