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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Well then just my circuit with shorted diode, lamp shold have too low voltage on it and no illuminate... When switch is pressed other one is shorted and first gets enough voltage to glow. Or everybody just completly missed the point
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
That with two batteries suffers from same problem as my circuit: Here bulb B will have some voltage (6V) on itself, trough 12 ohm resistor. Mine has split its voltage trough other bulb. Same happens with mine circuit without diode... Obivously its not allowed to have any voltage on bulbs??
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Firkragg wrote ...
That with two batteries suffers from same problem as my circuit: Here bulb B will have some voltage (6V) on itself, trough 12 ohm resistor. Mine has split its voltage trough other bulb. Same happens with mine circuit without diode... Obivously its not allowed to have any voltage on bulbs??
Lots is unexplaned here...
The voltage drop on the resistor is 12V (Ohm's law; the 24V supply divides equally between resistor and bulb A) and the "balancing" battery voltage is also 12V, so the bulb A "sees" 12-12=0V; unless the switch is pressed. The switch shorts out bulb A and now bulb B sees the two batteries in series but the 12V batt is connected "wrong way", so the voltage on bulb B is 24-12=12V.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
OK for that, thats the way it works, but im talking about circuit 12V battery-R2-bulbB and bulb has 6V on it in that circuit, just like mine (my circuit is different but it doesnt matter now) and im wondering is this ''allowed'' Should we say that bulb is on with 6V or not...
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Firkragg wrote ...
OK for that, thats the way it works, but im talking about circuit 12V battery-R2-bulbB and bulb has 6V on it in that circuit, just like mine (my circuit is different but it doesnt matter now) and im wondering is this ''allowed'' Should we say that bulb is on with 6V or not...
Err, could you please explain that to me a bit...? I don't see any reason why bulb B should have 6V on it... It has either 0V (12V on resistor and 12V battery cancel out) or 12V on it (when the switch is pressed)
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Electrical Quizzes - QUIZ 8 POSTED
