1. A bulb connected to a 220 V circuit, the current through the bulb is 0.5 A, the power on time is 1 h, how much energy does it consume? How many kilowatt hours?

1. A bulb connected to a 220 V circuit, the current through the bulb is 0.5 A, the power on time is 1 h, how much energy does it consume? How many kilowatt hours?

Power P = IU = 0.5 * 220 = 110W = 0.11kw
The power on time is one hour
Electric energy = 0.11 * 1 = 0.11 kwh, equivalent to 0.11 kwh
0.11 degrees
If the bulb doesn't burn out, it should be 110W, 0.11 degree
p=ui=110w
w=pt=110w*3600s=396000J
It consumes 396000 joules of electricity, equivalent to 0.11 kwh.
There are two sections of wires 1 and 2. Under the same voltage, the current passing through wire 1 is larger, and the current passing through wire 2 is smaller. Which section of wire has higher resistance
Two, of course, because voltage = current * resistance
National standard 2.5 square 100 meters of copper wire, how much is the net weight of peeled copper?
Peeling, net weight of copper
National standard 2.5 square 100 m copper wire net weight of peeled copper
2.19---2.24 kg
Given power 500W, voltage 220V, how many a? U: what is the square of 380?
Single phase I = P / u = 500 / 220 = about 2.3A
Three phase I = P / 1.732/u/cos φ
U: What is the square of 380
In a circuit with only one resistor in series, what is the voltage at both ends of the resistor when the wire is connected to both ends of the resistor (both short circuited at the same time)?
When the power is short circuited. He didn't burn it.
You mean there is only one resistor in the whole circuit, and if the resistor is short circuited (in fact, the power supply is short circuited at this time), then the voltage at both ends of the resistor (actually measuring the voltage of that wire) is 0. If the power supply is burnt out or not, the voltage at both ends of the resistor is 0
The voltage is 0
What is simultaneous short circuit? Follow up: the power supply is short circuited anyway
How heavy is a 100 meter copper wire of 2.5 square meters?
Copper wire weighs 2225g, with 20% insulation, the total weight is 2670g
How much current is 3.3 KVA at 220 V?
For single-phase electricity, I = 3300 / 220 = 15A
For three-phase electricity, I = 3300 / 380 / 1.732 = 5A
There are two sections of wires 1 and 2. Under the same voltage, the current passing through wire 1 is larger and the current passing through wire 2 is smaller. Which section of wire has higher resistance?
According to Ohm's law,
The current in a conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor
I = u / R, r = u / I,
If the voltage is the same, the current of a is large and the resistance is small; the current of B is small and the resistance is large
So the resistance of B is relatively high
Bv line weight formula of 2.5 square national standard
How much copper and how much plastic
Bv wire bv wire price bv wire specification bv wire by wire 1.5,2.5,4, BV wire 6,10,25,35 square bv wire by wire 1.5,2.5,4,6,10,25,35 square bv wire and cable wl-by type low smoke halogen-free polyolefin insulated wire product application this product is used for exchanging extra voltage 450 / 750V and below
How many kilowatts of electricity do you use per hour
1. If the current is 5A and the voltage is 220V, the power is 1100W
2. The definition of per kilowatt hour is 1 kilowatt hour, so power consumption per hour = 1.1KW * 1 = 1.1 kilowatt hour