Same, I said the voltage in each branch is 1.5V, and the current in each branch is 9.2mA since they are connected in parallel, and since current is conserved at a junction the total current is 18.4mA so the reading doubles

Reply 26

itayrofe

Mark scheme for the very last Q with the loudspeakers

Another Very reliable mark scheme:
1. an alternating current passes through the coil of the loudspeaker. AC changes direction continuously.
2.this produces an alternating magnetic field which interacts with the field of the permanent magnet.
3.as the current in the coil changes direction, the direction of the force on the coil also changes direction. the coil vibrates backwards and forwards.
4.as the coil is connected to the paper cone, the cone also vibrates backwards and forwards producing sound waves/longitudinal by vibrating particles in the air around it.

(edited 11 months ago)

loudspeakers.png52.8KB

Reply 27

badatfrench00

Original post by itayrofe

Mark scheme for the very last Q with the loudspeakers

Out of interest how do you get the screenshot? Is it jus from a past paper question that asked similar question

Reply 28

catsforever1154

Original post by themonke

Yep same, sounds promising

Reply 29

itayrofe

Original post by badatfrench00

Out of interest how do you get the screenshot? Is it jus from a past paper question that asked similar question

yea i linked two different types of answers in my last post here

also
1. an alternating current passes through the coil of the loudspeaker. AC changes direction continuously.
2.this produces an alternating magnetic field which interacts with the field of the permanent magnet.
3.as the current in the coil changes direction, the direction of the force on the coil also changes direction. the coil vibrates backwards and forwards.
4.as the coil is connected to the paper cone, the cone also vibrates backwards and forwards producing sound waves/longitudinal by vibrating particles in the air around it.

Reply 30

Djdb2007

If I talked about resistance decreasing and so current increasing. Will I still get marks, cause I didn’t talk about halves and doubles.

Reply 31

itayrofe

OK I found the 4 mark about loudspeakers from JAN 2023 so basically the latest exam before ours.

CHECK IT OUT. :smile:

loudspeakers 2023 jan.png47.1KB

Reply 32

themonke

Original post by itayrofe

OK I found the 4 mark about loudspeakers from JAN 2023 so basically the latest exam before ours.

CHECK IT OUT. :smile:

Ye thats basically what i put.
What did you put for the 3 marker on the ring?

Reply 33

itayrofe

the exam was great apart from the last two questions so I didn't get full marks for the gold ring and the loudspeaker.

Reply 34

kmat1893

Original post by themonke

Ye thats basically what i put.
What did you put for the 3 marker on the ring?

What did eveyone get for the voltage question in mA

Reply 35

sk41

Original post by kmat1893

What did eveyone get for the voltage question in mA

can anyone send the method for this aswell

Reply 36

catsforever1154

Original post by sk41

can anyone send the method for this aswell

I got about 9.16mA I think. You had to do 1.5-0.63 = 0.87 V to work out the voltage across the resistor and then use V=IR to work out current so 0.87/95 = 9.16

(edited 11 months ago)

Reply 37

itayrofe

Original post by themonke

Ye thats basically what i put.
What did you put for the 3 marker on the ring?

I wasn't sure what mA so I wrote 9.15789 mA and next to it, I wrote 9157.89 mA. do you reckon I will still get marks for it even if I filled the answer line with the 9157.89mA?

Reply 38

catsforever1154

Original post by itayrofe

I wasn't sure what mA so I wrote 9.15789 mA and next to it, I wrote 9157.89 mA. do you reckon I will still get marks for it even if I filled the answer line with the 9157.89mA?