Posted through Lim Zi Ai | Apr 26, 2018 | Electricity, major 5 Science, major School Science approaches | 0 |

In today’s post on Electricity, I will be explaining how to identify if bulbs are arranged in collection or parallel prior to discussing your respective advantages and disadvantages v the aid of a question.

You are watching: Light bulbs in series vs parallel brightness

Previously, we have questioned the plan of wires in a irradiate bulb and that is effects.

In enhancement to knowledge that concept, that is additionally important for students to have the ability to identify the different arrangements of bulbs in an electric circuit – series and parallel.

After which, they have to understand that arranging the bulbs in a particular arrangement has its advantages and disadvantages.

## Question

### Diagrams of Circuit A and also Circuit B

We deserve to see from the diagrams the both Circuit A and also Circuit B have actually 2 batteries and 2 bulbs each.

The only difference (other than the variety of switches) is the position of the bulbs in the circuit. Once there room two bulbs in a circuit, they have the right to either be arranged in collection or in parallel.

However, numerous students often have misconceptions around the meaning of bulbs in “series” and “parallel”. They tend to combine bulbs arranged in series to be bulbs put next to every other and bulbs in parallel to be one bulb placed on top/below of another bulb, i beg your pardon is inaccurate.

When the bulbs in a circuit room arranged in series, over there is only one pathway that electrical energy can flow through. Once bulbs room arranged in parallel, there is more than one pathway in the circuit that electrical energy can circulation through.

Therefore, in stimulate to identify the kinds of bulbs in a circuit correctly, college student should identify the number the pathways that electricity is may be to flow through in a circuit.

Circuit A

In the chart above, I have actually traced in red how electrical power flows native one finish to the other finish of the battery because that Circuit A. We have the right to see that there is only one pathway that electricity can flow through the bulbs in Circuit A. Thus, the bulbs in Circuit A room arranged in series.

Circuit B

In the 2 diagrams above, I have traced in green and also yellow the two feasible pathways that power can flow through from one finish of the battery come the other. With these diagrams, that is clear the there is an ext than one possible pathway that power can flow through the bulbs. Thus, the bulbs in Circuit B room arranged in parallel.

(a) What is the difference between the arrangements of the bulbs in circuits A and also B?

The bulbs in Circuit A are arranged in series while the bulbs in Circuit B room arranged in parallel.

Now that we have acquired a better understanding the what it method to arrange bulbs in series and in parallel, allow us discuss the benefits and defect of these two arrangements. Over there are 4 points the comparison between the series arrangement and the parallel plan of bulbs:

Brightness of the bulbLifespan of batteriesIndependent manage of bulbsWhether the other bulbs in the circuit will still irradiate up when one bulb fuses

### Comparison 1: Brightness of the bulb

The number of batteries in a circuit identify the quantity of electrical power flowing v each pathway. Additionally, the brightness that the bulb corresponds to the amount of electrical power it receives. V the over in mind, let us currently work out the brightness that the bulbs together. Note: 1 battery to represent 1 unit the electricity.

Series

In the circuit above, there space two batteries. This method that there are 2 devices of electrical energy flowing through the red pathway. As electrical power passes with both Bulbs A and B, the 2 bulbs re-publishing the 2 systems of electrical power equally. 2 devices of electrical power ÷ 2 bulbs → each pear receives 1 unit the electricity since the brightness of the bulb corresponds to the lot of electrical power it receives, each bulb in this series circuit has a brightness of 1 unit.

Parallel

Recall that the number of batteries in a circuit identify the amount of power flowing with each pathway.>

Comparing the brightness the the bulbs

The bulbs in the series circuit have a brightness the 1 unit, if the bulbs in the parallel circuit have actually a brightness of 2 units.

Therefore, we can see the if all various other variables were maintained constant, bulbs i ordered it in parallel space brighter 보다 bulbs i ordered it in series.

### Comparison 2: expectancy of batteries

Series

Each pear in the above circuit uses 1 unit that electricity. Therefore, in total, the batteries require to produce 2 units of electricity for the bulbs arranged in series.

Parallel

Each pear in the over circuit supplies 2 units of electricity. Therefore, in total, the batteries require to create 4 units of electrical power for the bulbs arranged in parallel. Comparing the expectation of the batteries The batteries in a parallel circuit need to produce more units of electrical power than the battery in a series circuit. Thus, we can infer the the batteries in a circuit through bulbs arranged in parallel will be provided up more quickly and have a shorter lifespan.

### Comparison 3: Independent control of bulbs

Series

When switch 1 is open, there is an open circuit. Electrical power is unable to circulation through both bulbs A and also B, avoiding these bulbs native lighting up.

Parallel

Depending top top which component of the circuit whereby switches room installed, the bulbs deserve to be regulated independently.

In the case of the above circuit, as soon as switch 2 is open, over there is an open circuit v Bulb C.

Electricity is unable to circulation through pear C, avoiding Bulb C from lighting up. However, together switch 3 is closed, there is tho a close up door circuit with Bulb D. Power is able to flow through bulb D, permitting Bulb D to irradiate up.

Comparing the degree of manage

From the above, we can see that the bulbs arranged in parallel can be controlled independently of each other, conversely, the bulbs in collection will always be switched ~ above or off together.

### Comparison 4: even if it is the various other bulbs in the circuit will still light up when one bulb fuses

Let me carry out a quick arrival on what does it typical for a pear to fuse.

The filament is the component of the bulb the glows when electrical power flows through, bring about the pear to irradiate up. As soon as too much electricity flows with the filament, the filament overheats and also melts, resulting in a gap.

When bulbs have actually a melted filament, they have actually fused. Because of the space in the filament, electricity is unable to circulation through the filaments of unify bulbs, preventing them indigenous lighting up. Just how will one unify bulb impact the other bulbs in the circuits? The outcome relies on just how the bulbs space arranged in the circuit.

Series

When bulb A is fused, there is an open up circuit. Electrical power would not have the ability to flow with Bulb A, and consequently, bulb B. Thus, bulb B would certainly not irradiate up.

Parallel

When pear C is fused, over there is tho a close up door circuit through Bulb D. Electrical energy would be able to flow through Bulb D, permitting Bulb D to irradiate up.

Comparing the outcome when one of the bulbs fuses

When one of the bulbs in a parallel arrangement fuses, the various other bulbs in the circuit are still able to irradiate up. On the other hand, as soon as one that the bulbs in a series arrangement fuses, the various other bulbs in the circuit will not irradiate up. V the above analysis, allow us currently answer part (b). As the bulbs in Circuit B space arranged in parallel, us shall name the benefits and disadvantages of connecting bulbs in parallel.