All Questions
276
questions
-2
votes
5
answers
216
views
Why is my idea of voltage drop wrong?
when battery is connected to 2 ends of a wire, potential difference is created, this causes electric field causing electrons to move, the field gives the electron electric potential and the thus ...
- 19
2
votes
1
answer
69
views
Potential difference when two emf sources are connected in a simple loop circuit
I am having difficulty understanding the equation below for the potential difference between the two terminals of an electromotive source when two sources are connected from Sear and Zemansky's ...
-1
votes
1
answer
48
views
How do I create a highly conductive vapor cloud? [closed]
I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
- 877
0
votes
3
answers
76
views
Behaviour of current in Pure capacitive circuit with DC voltage across
A circuit has just 1 capacitor and a DC Battery (V volts) and the wire has no resistance. At time $t=0$ the capacitor is completely uncharged. How current in this circuit changes with time?
What i ...
- 367
0
votes
1
answer
55
views
What is the voltmeter measuring the PD of?
In the circuit diagram, the cell has an internal resistance, but when the switch is closed what does the voltmeter measure,
the pd of the cell, or the components in series?
- 111
-1
votes
5
answers
101
views
Question about Voltage in circuits
What does for example "9V on a battery measure" really measure, is it the electrical potential of a single Coloumb of charge provided by the battery? Is it the potential difference? If it's ...
- 29
2
votes
1
answer
46
views
Questions about batteries and circuits
If the electrical potential difference is the difference in potential energy over charge
Say we have a circuit, we plug it into a 1.5V battery, does that mean that for every coulomb of electrons ...
- 29
0
votes
0
answers
35
views
Phenomenon causing Voltage in Batteries
I have a simple question: you can think of a charged particle as a particle with mass, and hence there will be an electric field surrounding the charge, which causes electric potential energy (if ...
1
vote
1
answer
87
views
Purpose of potential difference in the presence of an electric field
Based on my understanding, charges are pushed along wires due to an electric field created by the battery, and charges gain electric energy as they loop through the battery. But I can't seem to ...
- 15
3
votes
1
answer
266
views
Is power of a battery constant?
In my question I'm neglecting the impact of discharging.
I'm trying to make sense of Watt's law: $$P=IV.$$ I always thought that the voltage and the power of a battery were constant features that ...
0
votes
1
answer
81
views
I find two different answers using Kirchoff's rules on single loop [closed]
I found this question in a book asking for voltage $X$. I allowed them to use any method they want. I too after revision using kirchoff's loop rules am getting too different answers. Please help me to ...
2
votes
1
answer
134
views
How to deal with the current going opposite direction through battery [closed]
Say that the current source is doing whatever it needs to do to output $1$A and that the battery is a $3$V battery. For simplicity, say the resistor is $1\Omega$.
I get that since we have $1$A ...
- 33
0
votes
1
answer
58
views
Power delivered to a Resistor is $V^2/R$. Does size of battery matter?
I had connected a thin Resistor wire to series combination of six coin cells or to a small sized 9V battery. The wire got hot in a normal way BUT when I connected the same resistance wire to a large ...
- 1,357
0
votes
1
answer
32
views
Determining if a capacitor will charge or discharge based on voltage [closed]
The question also says that the voltage of the battery is 12 V. We're supposed to determine if the capacitor is charging or discharging or neither. I'm just not sure how to use the voltages given to ...
- 1
0
votes
3
answers
75
views
Weird Potential Divider Diagram
How does the above circuit work? My textbook only has potential divider circuits such that there is only one output voltage. Such as this one.
Could we replace the arrowed line in the uppermost ...
