You will need

- tester, wattmeter, voltmeter, ammeter

Instruction

1

On most lamps specify their power consumption and the nominal voltage at which the lamp operates. For example, if a bulb is written 220 V and 60 W, it means that when included in the network with a voltage of 220 V, its capacity will be equal to 60 watts. This is the maximum power that could give this lamp.

2

If the power lamp does not have it or it works in a network with a voltage below nominal (if the voltage is above nominal, to happen a short circuit, and it will simply burn out), measure its power independently. Connect the tester in the mode of the wattmeter in parallel with the lamp, connect it to the power source, it will show its power.

In the absence of power meter power operating lamp can be calculated independently. To do this, connect the lamp to the current source. Consistently it will connect the ammeter and parallel voltmeter. Closing the lamp to the power source, remove the current reading from the ammeter in amperes, and the voltage of the voltmeter in volts. For this you can use a conventional tester, just to measure the voltage, connect it parallel to the lamp and current - in series. Find the product of the current to voltage. The result is the lamp power in watts.

In the absence of power meter power operating lamp can be calculated independently. To do this, connect the lamp to the current source. Consistently it will connect the ammeter and parallel voltmeter. Closing the lamp to the power source, remove the current reading from the ammeter in amperes, and the voltage of the voltmeter in volts. For this you can use a conventional tester, just to measure the voltage, connect it parallel to the lamp and current - in series. Find the product of the current to voltage. The result is the lamp power in watts.

3

If you know the resistance of the lamp, it is sufficient to only measure the current or voltage with a tester. If the measured voltage to determine the lamp power, lift its value in the square and divide by the resistance: P=U2/R. If you know the amperage, the power calculation, find the product of the square of current and resistance values: P=I2•R. the measurement of voltage and current on the DC source be sure to consider the polarity of the measuring instruments, so they don't spoil. Attaching devices connect devices with disconnected power source.

# Advice 2: How to calculate the lamp power

For proper illumination of rooms, corridors or free-standing object, such as aquarium, you need to determine the appropriate type of lamp: number, location and

**capacity of the**installed lamps. There are a few rules, doing that, just to perform this task.You will need

- roulette, sheet of paper, pen, calculator

Instruction

1

For the General calculation of the lamps use the following formula: P=pS/N, p –power, the specific lighting, measured in Watts per square meter (the average is 20 Watts per square meter), S is the area of the premises, for which this lamp is calculated in square meters and N is the number of lamps.

2

Example: calculate the room measure the length and width of the room. The results obtained (for example, 3.3 meters long and 4.5 meters wide) between multiply and get the area of this room (3,3 × 4,4 = 14,85 square meters). This figure multiply by 20 and divide by the expected number of bulbs in lamps. For example, take the 3 lamps on 2

**lamps**in each. In this case, 14,85 multiply by 20 and divide by 6 (3×2=6). Get the result, which means that in this case, you have 6 lamps at 49.5 Watts.3

Can vary the wattage in each lamp, dividing the room into several zones with different lighting. The total power of all lamps in the room should not be less than 297 Watts.

4

In some cases it is necessary to take into account the specifics of the premises, which make the calculation of the total power of the installed lamps. In this case, do the calculation, substituting the value of the coefficient p in the table below:property Type|incandescent Lamp|Halogen lamp|fluorescent svyatetsky room..............30-85....................70-85....................15-22

Living room.....................15-35....................25-35....................7-10

Bedroom......................10-25....................15-17....................4-7

Corridor......................10-20....................10-13....................3-5

Kitchen........................15-40....................30-37....................6-10

Bathroom...............15-30....................22-27....................6-9

Storage room, garage..............12-15....................11-14....................3-5Здесь, to calculate, for example, lighting in the kitchen (area 3 meters square) with the use of fluorescent lamps, take the coefficient of p (average 9) from table, multiply by the kitchen area and if you will be trehrozhkovye lamp, divide by three: 9×3/3 = 9 Watts in each of the three installed in the lamp bulb.

Living room.....................15-35....................25-35....................7-10

Bedroom......................10-25....................15-17....................4-7

Corridor......................10-20....................10-13....................3-5

Kitchen........................15-40....................30-37....................6-10

Bathroom...............15-30....................22-27....................6-9

Storage room, garage..............12-15....................11-14....................3-5Здесь, to calculate, for example, lighting in the kitchen (area 3 meters square) with the use of fluorescent lamps, take the coefficient of p (average 9) from table, multiply by the kitchen area and if you will be trehrozhkovye lamp, divide by three: 9×3/3 = 9 Watts in each of the three installed in the lamp bulb.