Q&A - PSLE Science

[Alarmchain]

http://farm8.staticflickr.com/7279/7744385746_e5a136dc2f_m.jpg\">


So sorry, kitty2, didn’t mean for my discussion to take away attention to your question.

Perhaps, this diagram may help.

Assume both circuits have a voltage source of 2U. If all the bulbs used are similar, you will see that in the series circuit, the voltage source will be shared equally with the 2 bulbs, resulting in each bulb having only a voltage of 1U across it. Compared with the parallel circuit, each bulb will still have a voltage of 2U across each.

Because of this, bulbs in the parallel circuit will be brighter (2U) than those in the series circuit (1U).

Hope this helps.

[charsen]

rains:

charsen:

[quote=\"kitty2\"]Series or parallel circuit is brighter?Circuit with series battery is bright or with parallel battery?Circuit with series bulb is brighter or with parallel bulb?


Please help as my nephew is very confused with the above.

Thanks

It depends on the arrangement of batteries or the arrangement of bulbs of the circuit.I can tell what the brightness of the bulb is when you say the arrangement of batteries is in series or parallel or the arrangement of bulbs is in series or parallel.
Cheers

Please let me know your answers for the above.Thanks[/quote]Hi,

MOE syllabus stipulates that only bulb arrangements be tested. Battery arrangement is out of the syllabus.

Bulbs in a parallel circuit are brighter than bulbs in a series circuit.

Hope this helps.[/quote]
Hi
According to the latest science syllabus by MOE,there is battery arrangement and bulb arrangement.In the 'My Pals are here ' systems text book which is approved by MOE , have battery arrangement.You may want to take a look at it.
cheers

[charsen]

Winx5015:

Hi, anyone know the answer for the following questions? Thanks!

http://i50.tinypic.com/353bgww.jpg\">

Hi
Your image is not clear. Please make it clearer so that i can see the problem.
cheers

[Michaelia0816]

charsen:

Winx5015:

Hi, anyone know the answer for the following questions? Thanks!

http://i50.tinypic.com/353bgww.jpg\">

Hi
Your image is not clear. Please make it clearer so that i can see the problem.
cheers

I had made the picture clearer, this web,
http://t.co/TsFRQN2p

Charsen, pls help with my science question, pls?

[Michaelia0816]

Pls Help,

http://t.co/ubId9oan
http://t.co/xYJQ7V3K
http://t.co/bmTvNJ1x
http://t.co/Pwpyj15M

[charsen]

Michaelia0816:

Pls Help,

http://t.co/ubId9oan
http://t.co/xYJQ7V3K
http://t.co/bmTvNJ1x
http://t.co/Pwpyj15M

Hi
For the first link,(p) is tadpole and (q) is fish.You'll have to find the relationship between the fish,the plants and the aquarium.The key is 'omnivorous fish'.

For the second link,the question is testing you on your knowledge of friction.
The surface which has a rougher surface will lead to the car traveling a shorter distance than the other one.Using this clue, you can sketch accordingly to the question.

For the third link,The question is quite tricky.You know that cement floor is the roughest surface among the items listed in the question.Thus, the cement floor is grouped under 'd'.The problem starts know.Some will be stuck on this area where there are sand and grass.I relate this to sports. The tennis court grounds are mainly made out of grass.This shows you that when people play tennis,the friction between the person's shoes and to the grass is almost the same when the person is standing on concrete floor.This example says that grass's roughness is almost the same as cement floor and rougher than sand.

For the fourth link, The question is testing you on your graph interpretation skills.you should know that x axis is the independent variable and y axis is the dependent variable.Using this clue, you can solve the question.
cheers

[Michaelia0816]

Thx Charsen, you are making me to understand

[kitty2]

Alarmchain:

http://farm8.staticflickr.com/7279/7744385746_e5a136dc2f_m.jpg\">


So sorry, kitty2, didn’t mean for my discussion to take away attention to your question.

Perhaps, this diagram may help.

Assume both circuits have a voltage source of 2U. If all the bulbs used are similar, you will see that in the series circuit, the voltage source will be shared equally with the 2 bulbs, resulting in each bulb having only a voltage of 1U across it. Compared with the parallel circuit, each bulb will still have a voltage of 2U across each.

Because of this, bulbs in the parallel circuit will be brighter (2U) than those in the series circuit (1U).

Hope this helps.

:thankyou: :celebrate:

[kitty2]

rains:

charsen:

[quote=\"kitty2\"]Series or parallel circuit is brighter?Circuit with series battery is bright or with parallel battery?Circuit with series bulb is brighter or with parallel bulb?


Please help as my nephew is very confused with the above.

Thanks

It depends on the arrangement of batteries or the arrangement of bulbs of the circuit.I can tell what the brightness of the bulb is when you say the arrangement of batteries is in series or parallel or the arrangement of bulbs is in series or parallel.
Cheers

Please let me know your answers for the above.Thanks[/quote]Hi,

MOE syllabus stipulates that only bulb arrangements be tested. Battery arrangement is out of the syllabus.

Bulbs in a parallel circuit are brighter than bulbs in a series circuit.

Hope this helps.[/quote]

:thankyou:

[Michaelia0816]

charsen:

Michaelia0816:

Pls Help,

http://t.co/ubId9oan
http://t.co/xYJQ7V3K
http://t.co/bmTvNJ1x
http://t.co/Pwpyj15M

Hi
For the first link,(p) is tadpole and (q) is fish.You'll have to find the relationship between the fish,the plants and the aquarium.The key is 'omnivorous fish'.

For the second link,the question is testing you on your knowledge of friction.
The surface which has a rougher surface will lead to the car traveling a shorter distance than the other one.Using this clue, you can sketch accordingly to the question.

For the third link,The question is quite tricky.You know that cement floor is the roughest surface among the items listed in the question.Thus, the cement floor is grouped under 'd'.The problem starts know.Some will be stuck on this area where there are sand and grass.I relate this to sports. The tennis court grounds are mainly made out of grass.This shows you that when people play tennis,the friction between the person's shoes and to the grass is almost the same when the person is standing on concrete floor.This example says that grass's roughness is almost the same as cement floor and rougher than sand.

For the fourth link, The question is testing you on your graph interpretation skills.you should know that x axis is the independent variable and y axis is the dependent variable.Using this clue, you can solve the question.
cheers

Charsen, I did not understand the link 4 and link 2