IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Sue T on December 02, 2009, 12:21:37 pm

Title: physics 9702 (cie) question
Post by: Sue T on December 02, 2009, 12:21:37 pm

its a past paper question
MJ 06 paper 2
question 7 (b)

in the mark scheme it says:
shorted lamp A would cause damage to the supply/lamps
/blow fuse in supply

i dunno y theyre talkin bout lamp A now  ???

Title: Re: physics 9702 (cie) question
Post by: astarmathsandphysics on December 02, 2009, 12:31:00 pm

Lamp A is in series with Lamps B and C so the current through A is the sum of the currents through B and C. Lamp A will probably be the most likely to be damaged.

Title: Re: physics 9702 (cie) question
Post by: halosh92 on December 02, 2009, 12:50:25 pm

Quote from: astarmathsandphysics on December 02, 2009, 12:31:00 pm

Lamp A is in series with Lamps B and C so the current through A is the sum of the currents through B and C. Lamp A will probably be the most likely to be damaged.

ive got the same doubt i dont get it either ???

Title: Re: physics 9702 (cie) question
Post by: astarmathsandphysics on December 02, 2009, 01:13:21 pm

The only way from one supply terminal to the other is through lamp A. It will experience max current so be most likely to blow.

Title: Re: physics 9702 (cie) question
Post by: halosh92 on December 02, 2009, 04:18:32 pm

Quote from: astarmathsandphysics on December 02, 2009, 01:13:21 pm

The only way from one supply terminal to the other is through lamp A. It will experience max current so be most likely to blow.

oh ok thx alot sir :D

Title: Re: physics 9702 (cie) question
Post by: Sue T on December 04, 2009, 12:29:02 pm

i forgot 2 say thank you ;D