After graduating from primary school, I want to ask a relatively retarded question about series-parallel circuits. I hope you don't joke. Namely: 1. How to consider when to connect in series,

There is a big difference between series and parallel. note:

Series connection means that the sum of the voltages of two appliances is the total voltage. For example, if the coil and the bulb are connected in series in the drawing, the power supply will be divided between the coil and the bulb. As a result, the voltage is not enough and they can't work normally. If connected in parallel, the voltage is the same, and it can work normally.

If two bulbs with the same power 1 10V are connected in series to form 220V, each bulb is 1 10V, and they all emit light normally.

Two contacts: If connected in series, both contacts must be connected before connecting the circuit. As long as one of the parallel connections is connected, the circuit is connected.