If the filament of the bulb in the home circuit is broken, and the insulation of the wire is damaged, you should choose the method of maintaining the circuit A. Replace the bulb B. replace the fuse C. replace the wire and connect it D. replace the switch

If the filament of the bulb in the home circuit is broken, and the insulation of the wire is damaged, you should choose the method of maintaining the circuit A. Replace the bulb B. replace the fuse C. replace the wire and connect it D. replace the switch

As shown in the figure is the circuit diagram for measuring the voltage at both ends of the small bulb and the current passing through the small bulb. If a student chooses the correct range of the two meters in the process of operation, but accidentally adjusts the positions of the two meters, close the switch S ()
A. Bulb is not on, ammeter and voltmeter are damaged B. bulb is not on, ammeter is damaged, voltage indication is zero C. bulb is on, ammeter has indication, voltage indication is zero D. bulb is not on, current indication is zero, voltmeter has indication

When the position of voltmeter and ammeter is interchanged as shown in the figure, the voltmeter is connected in series in the circuit and can measure the power supply voltage, so it has indication, but the internal resistance of the voltmeter is very large. According to Ohm's law, the current in the circuit will be very small at this time, so the current indication is almost zero, and the lamp bulb is not on

A physics problem of grade three in junior high school```
In order to save money, someone designed and installed a home lighting circuit in the countryside. Only one wire was used to connect the live wire of the power supply line. After the switch and the lamp were connected in series, one end was connected to the live wire, and the other end was inserted into the ground. This paper tries to analyze: (1) can the designed circuit work? (2) is the designed circuit dangerous? Why?
Is there anything simpler? I don't know the MS of Kuabu voltage.

I can work
Dangerous, because the lamp is connected in series with the live wire, when people change the lamp, it is easy to get electric shock, and can't control the switch of the lamp!
Ha... I'm also from junior three!
But I learned these questions in the second year of junior high school!

In the circuit shown in the figure, the power supply voltage remains unchanged. After closing the key s, the circuit works normally. After a while, the number of two meters suddenly turns to zero, then the fault in the circuit may be ()
A. Resistance R open circuit B. lamp l open circuit C. resistance R short circuit D. lamp L short circuit

A. Resistance R open circuit, no current in the circuit, ammeter no indication; voltmeter positive and negative terminals through filament, wire connected to the positive and negative poles of the power supply, voltmeter has indication, not in line with the meaning; B, lamp l open circuit, no current in the circuit, ammeter no indication; voltmeter positive and negative terminals can not be connected to the positive and negative poles of the power supply, voltmeter no indication, in line with the meaning; C, resistance R short Circuit, the circuit only lights, voltmeters and ammeters have indication, not in line with the theme; D, l short circuit, the circuit only resistance, voltmeters and ammeters have indication, not in line with the theme