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# brightness of bulbs in series and parallel

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Question:How does adding an extra bulb on a branch of a parallel circuit effect brightness? Lets say a parallel is connected to a series circuit. How does adding an extra bulb on the series circuit before the parallel circuit effect brightness? I know its something to do with resistance and amperage, but i dont quite understand. I have a physics exam soon, and these questions always come up :( Any help is appreciated :D

Answers:The current in series passes from one bulb to another and the power gets lesser as it passes from bulb to bulb but in parallel the current passing is same for all the light bulb thus having a brighter glow than the series curicut and the more bulb that you add in series will decrease as the power lowers as the current passes from the negative end to the first bulb than to teh second bulb than to the third and so on till it comes back to the positive end back at the battery or power source

Question:You are given three resisters, a flashlight bulb, and a battery. Would a parallel or series circuit produce the brightest bulb? Which one would produce the dimmest bulb?

Answers:The parallel circuit where the resistors are connected in series to each other and the bulb is connected in parallel to the resistors - however, this may blow up the bulb if the voltage of the battery is much higher than the bub's ratings! If the bulb and the resistors are connected in series, the current flowing through the bulb would be minimum and the brightness thus least.

Question:Just a question on distribution of current and voltage. In parallel circuits, the current supplied to each branch is the current from the battery divided by the amount of branches, right? And how about the voltage? How is voltage distributed in parallel circuits? Is it even divided? In series circuits, the current is the same throughout the circuit, right? And the separate voltages in series circuits all add back up to the e.m.f., right? Just wanted to clarify things, cause I've got a question here, about a circuit A, with a bulb, then a circuit B, with the same e.m.f., but now 2 bulbs, in parallel. It wants to know if the brightness of the bulbs will be changed from the bulb in circuit A. Then it gives us a circuit C, same e.m.f., but now the bulbs are in series, and it asks the same question.

Answers:Parallel: V is the same for all the elements. i is inversely proportional to the resistance in each element.(i1 = V/R1, etc) Series: You have it right. 2 bulbs in parallel with same EMF: brightness the same as A. Same 2 bulbs in series: i = and power from each bulb = of A Rp = R1*R2/(R1+R2);.....Rs = R1+R2

Question:I am currently studying electrical circuits at GCSE level. These questions involve ammeters,cells or battery, lamp or bulb,current and how it behaves. In your answers please do not include anything about voltage or resistors as i have not studied that yet. I understand at branches in a parallel circuit the current breaks up but i would like to know if a bulb were to break in a separate branch would that affect the current of another branch e.g does it receive all the current or the same amount that it already had. How does current affect the brightness of bulbs? e.g two bulbs and cell in a series circuit are they brighter or dimmer than two bulbs and a cell in a parallel circuit. Thank you for your answers they will be greatly appreciated

Answers:Well, ..., I know you don't want to hear about resistance but a light bulb is essential a light emitting resister. You're going to get into it soon enough so you might as well review Ohms laws (See the link below). In a circuit that is formed with two or more parallel branches with equal or unequal resistance the voltage drop remains the same across all branches but the current is drops with respect to the resistance in each branch. In a series circuit the opposite affect occurs the current remains the same but the voltage drops across each individual resister. Wiring lights in parallel is the best option as lights will remain uniformly bright over the course of the entire circuit. Wiring lights in series is worse as the first light burns brightest, the second less bright and so on until there's not enough voltage to light the last bulb without burning the first bulb out. and added benefit of a parallel circuit is that if one bulb burns out the others stay on. Where as, in a series circuit, if one bulb burns out (and it bout out in the open state - as most do) then the entire circuit goes dark.