How Does Resistance and EMF Affect Energy Transfer in a Circuit?

AI Thread Summary
The discussion revolves around calculating energy transfer and dissipation in a circuit with a wire resistance of 5.0 Ω and a battery with an emf of 2.0 V and internal resistance of 1.0 Ω. The user initially struggles to find the current, ultimately determining it to be 0.333 A using the formula i=E/(R+r). They successfully calculate that 80 J of energy is transferred from chemical to electrical form in the battery. After some confusion with power calculations, the user resolves their issues independently. The thread concludes with the user indicating they have found the solution.
justine411
Messages
16
Reaction score
0

Homework Statement



A wire of resistance 5.0 Ω is connected to a battery whose emf ε is 2.0 V and whose internal resistance is 1.0 Ω. In 2.0 min, how much energy is (a) transferred from chemical to electrical form in the battery, (b) dissipated as thermal energy in the wire, and (c) dissipated as thermal energy in the battery?


Homework Equations



P=iV
P=i^2r
P=iE(the fancy E)
Vb-Va=(E/(R+r))R
i=E/(R+r)


The Attempt at a Solution



I am having trouble finding the current, so I cannot find power.
I am using i=2.0V/(5.0+1.0)=0.333A
then I get Vb-Va=(0.333Ax5.0)
the answer for part a) is 80J
when I use P=iV I don't get that answer...

If I could make it more clear...I can, just post!
 
Physics news on Phys.org
nevermind, I figured it out on my own

BOARD CLOSED
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

The potential difference/EMF in RL circuits
Replies
6
Views
3K
What Is the EMF of a Cell with Given Energy Dissipation and Current?
Replies
4
Views
4K
Finding internal resistance & EMF of a battery in a circuit
Replies
11
Views
6K
How Do You Calculate the Resistance of a Voltmeter?
Replies
6
Views
2K
Resistance of the resistor and voltmeter's readings
Replies
25
Views
3K
How to solve for EMF and internal resistance in a circuit?
Replies
8
Views
3K
Internal resistance of the battery and energy transformed
Replies
14
Views
3K
Maximum Power dissipated at load resistor
Replies
3
Views
983
Find both the internal resistance of a battery and EMF
Replies
8
Views
2K
Unraveling the Mystery of EMF Internal Resistance
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top