Why are you struck by lightning when you are sheltering from the rain under a tree in a thunderstorm? Why can't we swim in the lake in thunderstorm weather?

1. When lightning strikes, there is a strong current passing through the lightning path between the clouds and the earth, which will bring harm to people. The path of lightning often passes through prominent parts on the ground, such as trees, tall buildings and outdoor antennas. So you will be struck by lightning when you are sheltering from the rain under a tree in a thunderstorm.

The voltage of lightning is tens of thousands of volts. When people swim, their heads are above the water, and there is water all around them. Your head is the tallest object, so lightning can easily hit people in the water. When you hit the surrounding area, water is generally a conductor, people are conductors, and people in the water are also struck by lightning.

2. According to the physical connection diagram, the current path is: power supply anode-lamp-switch-power supply cathode.

You can pull the switch on it or turn it upside down.

As long as the order of the circuit diagram is the same as that of the physical connection diagram. 3. When the ammeter is measured at different positions, the reading error is large.

In order to reduce the error, three ammeters can be connected to the main circuit, branch 1 and branch 2 at the same time to measure their currents.