- - Tester;
- - caliper;
- - line.
Carefully inspect the device or technical documentation.It should be specified rated voltage and rated power .For example, if it is written on the lamp 220, 100 W, it means that if a lamp included in a standard household network, in which the voltage is 220 V, the power consumption lamp is equal to 100 watts.
When one of these parameters is unknown, connect the device to the network and find a tester with the power of the current flowing through it and the voltage at which it works.To do this, configure the tester to operate as an ammeter.Attach it to the consumer series.If the device operates at a constant current, be sure to observe t
he polarity of the connection.Remove his testimony by measuring the current in amperes.
Then switch the tester to operate as a voltmeter and connect it with the correct polarity in the case of a constant current parallel device.Read the tester in volts.In order to find the power consumption , multiply the value of the voltage at a current P = U • I.
If you know the resistance of the device, which is in the documentation or measured with an ohmmeter, under which you can configure the tester.That measure only the force of the current or voltage.Then the power consumption is the product of the square of the current resistance P = I² • R.And if you measure the voltage, determine power consumption as the ratio of the square of the voltage to the resistance of the consumer P = U² / R.
motor power determined by its size.To do this, measure the diameter of the core, its the same length and the synchronous speed, check the motor pole pitch, but on it, using a special table motor constant motor constant.Calculate the power consumption , multiplying the motor constant at the core diameter in the square, and the length of the synchronous speed.The result multiply by 10 (^ - 6) (P = C • D² • l • n • 10 ^ (- 6)).The resulting power will kW.
Tip 2: How to calculate the power consumption
Currently, in every home there are plenty of devices powered by the mains.But often, especially in winter, the owners of all this home "Arsenal" are faced with a serious problem: the automatic ejection of traffic jams on the counter.The reason for this lies in the electrical overload.To this trouble did not happen, it is necessary to calculate the power consumption appliances and connect them to the grid through a power stabilizer.
- - phase meter;
- - instructions for electrical appliances;
- - Calculator.
Please note that the devices-consumed electricity are two kinds of power: active and reactive.A distinctive feature of the active load is a device that converts all the energy consumed to heat.Representatives of this group: electric kettles, irons, boilers, water heaters and other appliances.Accordingly, all other devices powered by mains electricity and is not converted into heat, belong to the second group, for example, an electric motor.
Remember that full power devices and active power closely interrelated.Their relationship is expressed in the formula: Ra = cosφ * P, where P - measure the total power of Ra - the active power and cosφ - Power factor (it can be defined by a phase meter, but in some cases this is not necessary, because the producersa passport or a device on the back of his body indicate cosφ value for that particular device).The index of active power can be found in the literature accompanying the product.Having two values (power factor and the active power), calculate the total power for each appliance used at home, the first group.
Performing count full power electrical appliances, do not miss the sight of one important point: all devices that are based is the compressor, for example, a pump or refrigerator, when the consume several times more energy thanoperation.In view of this, the nameplate capacity of these devices multiply by 5. Monitors and personal computers, too, have starting currents: their value exceeds the nominal figures three times.
Sum up the figures obtained total power used by individual devices.
Failure to perform these calculations and include both the network several devices with high power, the consequences can be devastating - and even the closure of the electrical fire.
Do not allow the regulator was working at full capacity: it significantly shorten its operational life.In order for this device to work in a power saving mode to the received calculation data (total apparent power), add about 20% of the total electrical load power.
- Counting capacity uninterruptible power supply
- how to calculate the power consumption