Timeline for Question about purely resistive incandescent lamps put in series and fed double normal voltage
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Dec 22, 2019 at 22:54 | comment | added | Tony Stewart EE75 | I trust you know how to change Lamp variables in Falstad | |
| Dec 22, 2019 at 22:34 | comment | added | David | It is very interesting (and somewhat surprising) that putting a 40W and 60W incandescent lights in series (keeping input voltage at 120VAC RMS), the wattage of the "40W" lamp actually goes UP to 47W and the wattage of the "60W" lamp goes down to 19W. This is something that I would not have guessed because I am adding resistance to the 40W circuit yet that part of the circuit is consuming more wattage that previously (without the "60W" lamp present). | |
| Dec 22, 2019 at 22:26 | comment | added | Tony Stewart EE75 | You can use bulbs as constant current sources when the bulbs are less than dim. Also when two 60W bulbs rated for120V are applied across 240V , BUT tolerances are +/-1% the one with higher actual on 120V will be lower in series @ 240V and visa versa for -1% | |
| Dec 22, 2019 at 22:14 | comment | added | David | Related: note that what I have found using low voltage incandescent lamps is that the wattage draw of them is proportional to Vf where Vf is the Voltage factor of the new voltage in question vs some known voltage and wattage combo. For example, if I put 18V thru a 12V 40W rated incandescent light, the voltage factor (Vf) = 18/12=1.5. The predicted wattage of that lamp at 18V (instead of 12V) would then be multiplied by Vf and by square root of Vf. So multiply by 1.5 and also by Sqrt(1.5) = 1.225 so 40 watts * 1.5 * 1.225 = 73.5 watts. If I used 24V, it would be 40 * 2 * 1.414 so 113 watts. | |
| Dec 22, 2019 at 16:19 | comment | added | Tony Stewart EE75 | A 40W+60W in series combined draw 66W but with actual power of 47W+19W tinyurl.com/qls3n89 Now you can compute 25W & 60W and then edit the simulation parts and check. TY @Pete | |
| Dec 22, 2019 at 16:14 | comment | added | Tony Stewart EE75 | Press Reset and see peak power settle to >10x Pd ratio with 40W +100W in series Proof tinyurl.com/u2buggd | |
| S Dec 22, 2019 at 16:09 | history | suggested | Pete Becker | CC BY-SA 4.0 |
Corrected typo
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| Dec 22, 2019 at 16:06 | review | Suggested edits | |||
| S Dec 22, 2019 at 16:09 | |||||
| Dec 22, 2019 at 16:00 | history | answered | Tony Stewart EE75 | CC BY-SA 4.0 |