- #1
Special One
- 32
- 1
- Homework Statement
- Total R AB
- Relevant Equations
- Ohm's Law
Gordianus said:R35 is wrong. R3 and R5 aren't in parallel. I suggest moving the bottom of of R5 to the bottom of R6. Repeat with R3 and R2. Draw the new circuit.
Gordianus said:No, don't move the top of R5, just move its bottom until it touches the bottom of R6
I completely disagree. It is exactly the kind of drawing that is given, and needs to be given, specifically to get beginners to learn how to recognize series and parallel elements.DaveE said:Recognize that those crossed resistors could have been just drawn in parallel with the others. It's a stupid trick to make the problem look harder than it is.
Gordianus said:Can't draw with my phone. Follow my instructions. Keep the top of R5 at the junction of R4, R6 and R7. Noe move the bottom of R5 to the bottom of R6.
OK, as a lesson in learning to read poorly drawn schematics, which they will surely encounter later. That seems like a worthwhile (but kind of annoying) vocational lesson, but not a great way to teach fundamental concepts.phinds said:I completely disagree. It is exactly the kind of drawing that is given, and needs to be given, specifically to get beginners to learn how to recognize series and parallel elements.
Gordianus said:Now I like it.
Of course you can. But beginners DON'T understand it and they need to learn and this kind of thing teaches them. Perhaps you. like I, had a facility for this stuff right out of the gate but lots of EE students don't.DaveE said:I believe, after decades of working as an EE, that I can tell if you really understand electronics by how you draw your schematics; like reading tea leaves, I guess.
Resistance is the measure of an object's ability to resist the flow of electric current. It is measured in units called ohms (Ω).
Total resistance is calculated by adding the individual resistances in a series circuit or by using the reciprocal of the sum of the reciprocals in a parallel circuit.
The factors that affect resistance include the material of the object, its length, cross-sectional area, and temperature. Materials with higher resistivity, longer lengths, and smaller cross-sectional areas have higher resistance. Resistance also increases with an increase in temperature.
In a series circuit, the total resistance is the sum of the individual resistances. In a parallel circuit, the total resistance is less than the smallest individual resistance due to the branching of current.
Higher resistance means there is less flow of electric current. This is because resistance reduces the amount of current that can flow through a circuit. Inversely, lower resistance allows for a greater flow of current.