That is a ridiculous statement (by whoever wrote it) because it makes no reference to what this bulb draws. Incandescent bulbs are rated in Volts and Watts which will give you 'I'. Your V drop will be Dependant on this Vs the capacity of the batteries.Hello,
I have read somewhere that it is OK to put three 1.5 V batteries in a bulb rated 3.5 volt because if you put the bulb onto the batteries, the batteries' volt will fall to 3.5. Is that true? How it comes?
http://www.kpsec.freeuk.com/components/lamp.htmVoltage rating
This is the supply voltage required for normal brightness. If a slightly higher voltage is used the lamp will be brighter but its lifetime will be shorter. With a lower supply voltage the lamp will be dimmer and its lifetime will be longer. The light from dim lamps has a yellow-orange colour. Torch lamps pass a relatively large current and this significantly reduces the output voltage of the battery. Some voltage is used up inside the battery driving the large current through the small resistance of the battery itself (its 'internal resistance'). As a result the correct voltage rating for a torch lamp is lower than the normal voltage of the battery which lights it!
For example: a lamp rated 3.5V 0.3A is correct for a 4.5V battery (three 1.5V cells) because when the lamp is connected the voltage across the battery falls to about 3.5V.
This implies that 3 AAA or 3 D cells would produce the same results...Not!http://www.kpsec.freeuk.com/components/lamp.htm
For example: a lamp rated 3.5V 0.3A is correct for a 4.5V battery (three 1.5V cells) because when the lamp is connected the voltage across the battery falls to about 3.5V.
For example: a lamp rated 3.5V 0.3A is correct for a 4.5V battery (three 1.5V cells) because when the lamp is connected the voltage across the battery falls to about 3.5V.