Why does the brightness of the light bulb dim when a 1200W electric kettle is connected to the home circuit resign from office because of age

The main reason is that the wire is too long or the wire cross section is too small, so that the wire resistance is too large and the power is relatively large. When the wire is connected to the circuit, the current increases sharply, and the line loss causes the voltage drop to be too large, that is, the voltage drops instantaneously, and the brightness of the bulb in the same line becomes dark

When we connect a 1200 watt electric kettle into the home circuit, we find that the brightness of the light bulb in the home is dim because ()
The resistance in circuit a is reduced
The ammeter in circuit B is small
C. the voltage at both ends of the bulb decreases
D the voltage between the live line and the zero line increases

But the reason is not what the people upstairs said, because the electric kettle and the lamp are connected in parallel, when the electric kettle is connected, the total resistance of the parallel circuit is reduced, and the total resistance will be smaller than the smallest one, and because the electric power of the electric kettle is large, the resistance will be very small, so the total resistance will be smaller after the electric kettle is connected

`When an electric kettle with a rated power of 1200 watts is connected to a home circuit, it is found that the brightness of the light bulb in the home is dim. What is the reason for this phenomenon?

The wires of this circuit are too thin and the internal resistance is too large
In other words, after the electric kettle is connected, the circuit is overloaded

An electric furnace connected in a 220 V circuit, the current passing through the normal operation is 3 A, what is the rated power of the electric furnace?
How much electricity is consumed in 4 hours?

Electric furnace power:
P＝UI＝220×3＝660(W)
Power consumption after 4 hours of power on:
66 × 4 = 2.64 (degree)

Why does the brightness of the light bulb dim when a 1200W electric kettle is connected to the home circuit resign from office because of age