GCE (A level) Physics E14 The resistance of series and parallel resistor combinations
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@Steve4Physics Sorry I thought you meant it by 'which certainly would be wrong!'. It makes perfect sense just ignore me! :D
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@Steve4Physics “equation 2R + 4R/3 = 10R” (which certainly would be wrong!)"
Sorry I thought you meant this equation would be wrong!
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@Steve4Physics true steve.
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@cha00halo Hi. Yes, total resistance = 10kohm+ (resistance the three other parallel resistors) (as explained in the video).
I should have stated that more clearly in my reply to you; but my reply was to explain how you had treated the three parallel resistors incorrectly.
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@Steve4Physics I made a mistake, but still wont the total resistance be 10kohm+ the three other parallel resistors (I thought you forgot the 10kohm resistor
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Hi. The resistance of the 3 parallel resistors is not 1/10kohm + 1/20kohm +1/30kohm, so you can’t just add that amount to the first resistance.
The total parallel resistance is ONE OVER the value of 1/10kohm + 1/20kohm +1/30kohm.
For parallel resistors, the formula is not:
RT = 1/R1 + 1/R2 + 1/R3 …
It is
1/RT = 1/R1 + 1/R2 + 1/R3 …
Hope that helps.
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Why is 2R + 4R/3 = 10R ? Sorry, my algebra starved brain can't comprehend. Your videos are superb! Much clearer than any physics lessons I had back in the day.
172anon 3 weeks ago in playlist Current Electricity
@172anon
Hi. I can’t find the equation “2R + 4R/3 = 10R” (which certainly would be wrong!). Do you mean (at about time 6:38) R + R + 4R/3 = 10R/3?
It’s like adding the fractions 2 and 4/3. Change all the terms to thirds, so it becomes 6/3 + 4/3 = 10/3.
2R is the same as 6x(R/3). So we are adding six lots of R/3 to four lots of R/3, to give 10 lots of R/3.
If that’s not what you mean, please give the time of the item in the video, which is causing problems.
Steve4Physics 3 weeks ago
@Steve4Physics Ah great, thank you. Completely overlooked that method. Why is '2R + 4R/3' different to 'R + R + 4R/3' though?
172anon 3 weeks ago
@172anon
Hi. You have lost me! ‘2R + 4R/3' is exactly the same as 'R + R + 4R/3'. They both equal 10R/3. If there is something in the video you think I got wrong, please give me the exact time so I can check it. I have spent sometime looking for a mistake but I can't find anything wrong. Cheers.
Steve4Physics 3 weeks ago