Ideal circuit with 4 resistances and one emf.

  • Thread starter Thread starter Mike88
  • Start date Start date
  • Tags Tags
    Circuit Emf
AI Thread Summary
The discussion focuses on solving a circuit problem involving four resistors and an ideal battery with an emf of 12.0 V. Participants seek to determine the size and direction of the current (i1) and the energy dissipated by the resistors over one minute. There is confusion regarding calculating the equivalent resistance and the correct method for finding the current through each resistor. Participants confirm that to find the energy dissipated, the power formula P = I²R should be used, emphasizing the need to know the current through each resistor. The original poster eventually resolves the problem independently.
Mike88
Messages
6
Reaction score
0

Homework Statement


In the figure below, R1 = 5.50 , R2 = 18.0 and the ideal battery has an emf E= 12.0 V.
(a) What is the size and direction of current i1? (Take right to be positive.)

(b) How much energy is dissipated by all four resistors in 1.00 min?

Homework Equations


I = E/R
resistive dissipation
P=i2R
P=v2/R

The Attempt at a Solution


I am having trouble trying to find the equivalent resistance to find the current i1. I know it should be in the positive direction to the right.

For part b should i just add up the dissapations for the 4 resistors?
 
Physics news on Phys.org
What figure? =D
For part b you are correct, P = I2R is the energy dissipated on that resistor, so you'd have to find the corresponding value of the current going through a particular resistor.
 
noumed said:
What figure? =D
For part b you are correct, P = I2R is the energy dissipated on that resistor, so you'd have to find the corresponding value of the current going through a particular resistor.

I forgot to attach it but i figured the problem out anyway.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Circuit analysis: Six resistors and two batteries
Replies
1
Views
2K
The potential difference/EMF in RL circuits
Replies
6
Views
3K
Find emf and the inner resistor of the battery
Replies
7
Views
2K
Power dissipated in this circuit with 2 batteries and 3 resistors
Replies
22
Views
4K
EMF and potential in a circuit
Replies
2
Views
1K
Calculate EMF & Resistance of Solar Cell
Replies
6
Views
2K
How to solve this chain with Kirchhoff's laws?
Replies
18
Views
3K
Why do the headlights on the car become dim when the car is starting?
Replies
4
Views
2K
Understanding a very simply RL circuit
Replies
1
Views
749
What Is the EMF of a Cell with Given Energy Dissipation and Current?
Replies
4
Views
4K

Hot Threads

Recent Insights

Back
Top