Current in the household electrical network having tension in two hundred twenty volts can vary from shares from thousands of amperes depending on what resistance is used.
The operating and amplitude value
The current proceeding in a household electrical network at connection of electric devices variable. It is caused by the fact that the voltage given to each house and developed by power plants is alternating. It means that both tension, and current change the value during time.
At the same time it is known that tension in an electrical network has accurate value in two hundred twenty volts. The fact is that there are two parameters which it is possible to characterize alternating current or tension and which do not change in time. These parameters are amplitude of current (tension) and the operating value. The first parameter is rather clear. Alternating current has oscillatory character, that is its value periodically changes, but remains within some maximum value. This value is also amplitude.
However, if to speak, say, about tension in lighting network in two hundred twenty volts, then it is possible to tell that it is not the amplitude of tension, but its operating value. In other words, operating value is used for characteristic of size of current or tension more often. It is caused by the fact that the operating value characterizes that power which dissipates on the device connected in an electrical network. Actually, the concept of the operating value was also brought out of these reasons. In number operating value of current is equal to value of current which when squaring will give an average for the period value of the power allocated on resistance. Such privilege of parameter of power is proved by the fact that it characterizes value of the energy consumed by users.
Value of current in an electrical network
So, to calculate the operating value of current in network, it is necessary to divide amplitude of current into a square root from number two. Respectively, to calculate amplitude it is necessary to make multiplication of this root and the operating value. Practically it is possible to make such calculation, having at itself the ampermeter of alternating current. Such ampermeter measures the operating value of current. Amplitude can be calculated already most. It is necessary to turn on in the scheme the ampermeter consistently with the device in which current is measured. Thus, it is wrong to speak about current in network if not to specify the device connected to this network because current always depends on resistance of the site of a chain, unlike tension parameter.