Give you a battery pack, two switches S1 and S2, two lights L1 and L2, and several wires. Design a circuit. Requirements: when S1 is closed only, L1 and L2 will light up; when S2 is closed only, L1 and L2 will not light up; when S1 and S2 are closed, L2 will not light up, L1 will light up, and it is bright

Give you a battery pack, two switches S1 and S2, two lights L1 and L2, and several wires. Design a circuit. Requirements: when S1 is closed only, L1 and L2 will light up; when S2 is closed only, L1 and L2 will not light up; when S1 and S2 are closed, L2 will not light up, L1 will light up, and it is bright

Description: 1. Battery pack switch 1, 2 bulbs connected in series circuit, 2, switch 2 and bulb 2 connected in parallel

Now there is a light bulb, an electric bell and a battery pack, switches S1 and S2 and several wires. A circuit is designed. When S1 and S2 are closed, the light will be on and the bell will ring; when S1 is closed and S2 is opened, the light will not be on and the bell will ring; when S1 is opened and S2 is closed, the light will be on and the bell will not ring

According to the analysis of S1 closed, S2 open light does not light up and the bell rings; S1 open, S2 closed light does not light up and the bell does not ring, it can be seen that the electric bell and the bulb are in parallel, and S1 controls the electric bell and S2 controls the bulb

Taking a place as the standard, if you walk 50 meters eastward, it should be recorded as - 50 meters, then if you walk 100 meters westward, it should be recorded as? The answer given is - 100 meters. Why?
There are no other complicated conditions

Taking a place as the standard and understanding it as the origin, the distance from any direction is negative