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### AuthorTopic: why does the lamp connected to a AC generator flicker?  (Read 840 times) Tweet Share

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#### Elnino_Gerrard

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##### why does the lamp connected to a AC generator flicker?
« on: November 08, 2010, 09:32:19 pm »
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Umm,TSFX 2008 exam question 10. ure given a AC generator 50 turns connected to a light bulb. It asks why does  the light bulb flicker. I know its got something with the power being supplied to it not being constant?but what would u write for 2 marks?
2010 VCE ATAR : 98.35

#### kyzoo

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #1 on: November 08, 2010, 09:35:08 pm »
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Power supplied to light bulb is given by formula P = VRMSIRMSsin2t since current supplied is AC. Thus power supplied to light bulb thus varies with time, going to 0W at certain points, therefore the light bulb flickers.
2009
~ Methods (Non-CAS) [48 --> 49.4]

2010
~ Spesh [50 --> 51.6]
~ Physics [50 --> 50]
~ Chem [43 --> 46.5]
~ English [46 --> 46.2]
~ UMEP Maths [5.0]

2010 ATAR: 99.90
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#### Elnino_Gerrard

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #2 on: November 08, 2010, 09:36:20 pm »
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Where did u get the sin^2 t?
My head is just not working today after that methods exam.
2010 VCE ATAR : 98.35

#### kyzoo

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #3 on: November 08, 2010, 09:37:30 pm »
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Where did u get the sin^2 t?
My head is just not working today after that methods exam.

2009
~ Methods (Non-CAS) [48 --> 49.4]

2010
~ Spesh [50 --> 51.6]
~ Physics [50 --> 50]
~ Chem [43 --> 46.5]
~ English [46 --> 46.2]
~ UMEP Maths [5.0]

2010 ATAR: 99.90
Aggregate 206.8

#### Elnino_Gerrard

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #4 on: November 08, 2010, 09:38:17 pm »
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Where did u get the sin^2 t?
My head is just not working today after that methods exam.

:O wtf never seen that before so is that for every scenairo or just ac generators?
2010 VCE ATAR : 98.35

#### kyzoo

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #5 on: November 08, 2010, 09:38:52 pm »
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Just AC generators, cause like DC has a constant output
2009
~ Methods (Non-CAS) [48 --> 49.4]

2010
~ Spesh [50 --> 51.6]
~ Physics [50 --> 50]
~ Chem [43 --> 46.5]
~ English [46 --> 46.2]
~ UMEP Maths [5.0]

2010 ATAR: 99.90
Aggregate 206.8

#### Elnino_Gerrard

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #6 on: November 08, 2010, 09:40:16 pm »
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huh so how would u get the power of a dc generator? just V RMS *I yes?
2010 VCE ATAR : 98.35

#### kyzoo

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #7 on: November 08, 2010, 09:41:42 pm »
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lol forget about the formula with sin^2 t, 99.999995% chance it is not in the course. For VCE Physics all you ahve to know is P = VI
2009
~ Methods (Non-CAS) [48 --> 49.4]

2010
~ Spesh [50 --> 51.6]
~ Physics [50 --> 50]
~ Chem [43 --> 46.5]
~ English [46 --> 46.2]
~ UMEP Maths [5.0]

2010 ATAR: 99.90
Aggregate 206.8

#### Elnino_Gerrard

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##### Re: why does the lamp connected to a AC generator flicker?
« Reply #8 on: November 08, 2010, 09:42:08 pm »
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Lol ohkay haha thanks.
2010 VCE ATAR : 98.35