Is it OK to write the resistance in parallel like this?

AI Thread Summary
Writing the equation for resistance in parallel is acceptable, and the method of using the reciprocal of the sum of the reciprocals is a common mnemonic. Pocket calculators simplify this process significantly compared to slide rules. It is important to ensure that the total resistance in a parallel network is always less than the smallest resistor present. The same formula for calculating total resistance can also be applied to inductors, while capacitors require a different approach. Overall, the discussion emphasizes the practicality and elegance of the parallel resistance formula.
TBert
Messages
7
Reaction score
0
I am creating an equations sheet for electronics forumlas and am wondering if it is OK to write the equation for resistance in parallel like this:
33bnUFo.png
 
Engineering news on Phys.org
TBert said:
I am creating an equations sheet for electronics forumlas and am wondering if it is OK to write the equation for resistance in parallel like this: View attachment 197492
Yes.
 
My memory rhyme was always "Reciprocal of the sum of the reciprocals"
which when pocket calculators came along in 1970's became quite handy.

Enter R,, press 1/x, press M+, repeat until all R's accounted for, press Recall Memory, press 1/x .

That's one place where a pocket calculator really outdoes a slide rule .

Your formula is much more elegant. Just make sure there's not a R0 !

have fun,.

old jim
 
  • Like
Likes Electron Spin
A bit off track but in // r's the total network R should always be smaller than the smallest resistor in ohms.

Also, a network has no P/S whereas a circuit has a power supply.

And again what Jimbo said... R total = the sum of the reciprocals, reciprocated. You can use the same formula for inductors as well, whereas capacitors you treat opposite.
 

Thread 'What happens if shielded cable has a short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Question about bonding ground and neutral'

I am not an electrical engineering student, but a lowly apprentice electrician. I learn both on the job and also take classes for my apprenticeship. I recently wired my first transformer and I understand that the neutral and ground are bonded together in the transformer or in the service. What I don't understand is, if the neutral is a current carrying conductor, which is then bonded to the ground conductor, why does current only flow back to its source and not on the ground path...
View full post »

Similar threads

Van der Pauw method for sheet resistance measurement
Replies
7
Views
1K
Calculating Input/Output Impedance w/ Parallel Resistors
Replies
7
Views
2K
Capacitor charging: Where do extra electrons come from?
Replies
3
Views
830
Determining inductive reactance from a 3-phase AC circuit
Replies
17
Views
3K
How does corona discharge create leakage current?
Replies
5
Views
1K
Eliminating a differential of an e-rickshaw by using 2 motors.
Replies
3
Views
241
Need help with a parallel inductance calculation for this transformer
Replies
2
Views
2K
Can I use individual capacitor IR for parallel circuit balancing resistors?
Replies
3
Views
2K
How will the voltage, current and resistance be distributed
Replies
4
Views
1K
Simplified modeling of teledeltos paper
Replies
5
Views
1K

Hot Threads

Recent Insights

Back
Top