A lamp will only operate at its rated power if it is subjected to its rated voltage. Increase that voltage will increase the power of the lamp -in other words, it will operate more brightly. This is how 'photoflood' lamps operate -they are deliberately designed to operate at overvoltage. Of course, this reduces the life of the lamp.
because it does!
Assuming that the voltage rating of the lamp matches the rated secondary voltage of the transformer, the lamp will operate at its rated power.
To answer this question a supply voltage must be stated. Also the wattage of the lamps is needed.
The voltage isn't decided by the lamp, but by the supply the lamp is hooked up to.
The formula for current is Amps = Watts/Volts. The lamp itself would draw 4.16 amps. Since the voltage of the lamp is 12 volts there is a internal transformer involved in the fixture itself. It doesn't matter what the input (primary) voltage to the transformer is, so long as it meets the manufacturer's specification as to the proper voltage to operate the fixture.
The voltage drop across each lamp would decrease as you add more lamps to a series circuit. This is because the total voltage in the circuit is divided evenly among the lamps, so each lamp receives less voltage as more are added.
its burn that lampAnswerI assume that you mean 'two lines', as you cannot connect anything across 'two phases'! The answer is that it depends on whether the line voltage exceeds the rated voltage of the lamp; if it does then the lamp will either burn out immediately, or have its life considerably shortened. If it doesn't then the lamp will operate normally or may even be dim. It's all to do with the rated voltage of the lamp, now how it's connected!
All a.c. voltages and currents are expressed in root-mean-square (rms) values. An rms voltage of 220 V is exactly equivalent to a d.c. voltage of 220 V. So the lamp will function quite normally at either voltage.
The operating voltage of a mercury lamp typically ranges from 100 to 300 volts, depending on the specific type and size of the lamp.
because it does!
the battery will stop working.
6 Volts.
The lamp needs to be rated for the voltage applied to it. The fixture in which the lamp is installed also needs to be rated for the voltage. So, it is not a matter of changing the lamp, it is a matter of having the fixture and lamp that are properly rated for the voltage that you are applying to it.
"When increasing the lighting, be sure to open up the diaphragm first instead of increasing the voltage on your lamp; the reason is that lamp life is greatly extended when used at low voltage." Source: Benson Microbiological Applications 11th edition pg.7
The voltage is greater than the applied voltage, why?
A lamp can be run by power from a telephone line.
Because the filament of a 25-W lamp has a higher resistance than that of a 60-W lamp and, therefore, will experience a greater voltage drop -the lamp with the voltage drop closer to its rated voltage (in this case, the 25-W lamp) will be the brighter.