I'm curious to know how does an electrical device can consume any amount of power it is required? Suppose the voltage here is 220V. How can you get any amount of electrical power say. 1000 watts out of it? Please tell me what I'm misunderstanding.
How does electrical devices consume power
electric-machinevoltagewatts
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Best Answer
The power line may be supplying a fixed voltage, like 220V, but how much current the device draws is up to the device. Power is voltage times current, so you can see how the device determines the power by determining the current.
For exmaple, in order to take 1 kW from a 220V line, a device would have to draw 1kW / 220V = 4.5A. If this were purely a resistor, it would be 220V / 4.5A = 48Ω. A 24 Ω resistor would take twice that power (2 kW), and a 96 Ω resistor half that (500 W). All these can be connected at the same time to the same 220 V line and each will still take the power calculated above.
At some upper limit, the 220 V line can't supply more current. At that point something has to give, like the voltage sag. In houses, a fuse will blow or a breaker pop before there is any significant sag.