How Does Increasing Resistance Affect Current Flow in a Circuit?

  • Thread starter Thread starter REEEEEEEE
  • Start date Start date
  • Tags Tags
    Analysis
AI Thread Summary
Increasing resistance in a circuit leads to a decrease in current flow, illustrating an inverse relationship. The discussion emphasizes the need for clarity in graphing current values against varying resistance while keeping other components constant. Questions arise regarding the source of data and the specific branches of the circuit represented in the graphs. Participants seek more detailed explanations of the experimental setup, including which resistances are fixed and which are varied. Clear communication of these parameters is essential for accurate analysis and understanding.
REEEEEEEE
Messages
10
Reaction score
0
Homework Statement
Graphically represent in EXCEL or equivalent program the characteristics
current-resistance (abscissa) of the three currents in the circuit. Comment the obtained graphic.
(Hint: Plot the theoretical, simulated and experimental characteristics and compare the
differences between values and their evolution).
Relevant Equations
U=RI (OHM'S LAW)
For example given the circuit
Captura de ecrã 2021-11-20 201327.png


I make the graphs :
Captura de ecrã 2021-11-20 201958.png


and comment that or graph 1 as resistance grows larger the current grows smaller (is inversely proportional) I will use the simulation and experimental data to check the values and conclude that this act is true.
Is this what I'm supposed to do?
 
Physics news on Phys.org
Those are odd-looking graphs. Where do those numbers come from? Which branch(es) of the circuit do the graphs refer to? What is being varied and what is constant? (e.g. if you are plotting the current through R2 as R2 varies, is R held constant? At what value? This is important, though the question as quoted doesn't make it clear.)
 
mjc123 said:
Those are odd-looking graphs. Where do those numbers come from? Which branch(es) of the circuit do the graphs refer to? What is being varied and what is constant? (e.g. if you are plotting the current through R2 as R2 varies, is R held constant? At what value? This is important, though the question as quoted doesn't make it clear.)
Above the graph you can se the values o current and resistance and I apologise or not explaining that the order goes rom top to botom:R1,R2,R.
 
But that is meaningless. Each set of values {R1, R2, R} will be associated with a particular value of the current - or, to be precise, with a particular set of values {IR1, IR2, IR}. What you need to do is graph one of these current values as a function of one of the resistances, e.g. IR vs. R while holding R1 and R2 constant. And do this in turn for each of the 3 currents.
 
mjc123 said:
the question as quoted doesn't make it clear
This ^^^.
Can you post the complete question? Maybe post a (good) picture with your phone?
What component values are fixed, and which are varied in the analysis?
 
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
Back
Top