Questions tagged [voltage]
Voltage is the unit of measurement for electronic potential, from one point location to another.
2,275 questions
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1 answer
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Working principle of Van de Graaff generator revisited
I have a few questions about principle how van de Graaff generator works. To avoid confusion I will use numbering from the wiki picture: [ADDED LATER #1] See also here for nearly identical ...
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What is the equation for the change in electric potential due to a field generated by a point charge? [duplicate]
I'm a current AP Physics 2 high school student with a test in a few days; a swift reply would be very much appreciated. Thank you in advance. My question is concerning the formula for the change in ...
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Two AC sources on a single circuit
What if we connect two AC sources with different frequencies in parallel and in series? What will the voltage and current flowing in the circuit look like? (Short circuit will not damage the sources)
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3 answers
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When do we consider that grounding the conductor makes the potential zero?
When do we consider that grounding the conductor makes the potential zero? I was recently seeing why is the outer charge of the system of grounded conducting plate becomes zero, and the reason given ...
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2 answers
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Electric current
I am trying to learn about electricity and how it works. I want it to make sense to me before diving to electronics. I understand that static electricity or a shock is the neutralisation of an ...
2 votes
2 answers
111 views
Potential difference across a bulb
I came across this question in DC Pandey Electricity and Magnetism: Image transcript: An electric lamp which runs at 100 V DC and consumes 10 A current is connected to AC mains at 150 V, 50 Hz cycles ...
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1 answer
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Opening the series link give ~0 V with two batteries, but what about two charged capacitors?
Setup (batteries). I connect two DC sources in series and measure across the outer terminals: (+ E1 -)——o——(+ E2 -) (and measuring from + of battery$_1$ to - of ...
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2 votes
2 answers
139 views
Confused about the reason why real current inside a battery flow opposite to the electric field
I've learned that the electric field points from the positive terminal (higher potential) to the negative terminal (lower potential). Since the force on an electron would be opposite to the field, ...
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1 vote
2 answers
154 views
Why is the Electric Potential Between Two Oppositely Charged Points Zero? [closed]
Assuming two charges of +5C and -5C are placed at points A and B respectively, why is the potential between them zero if the electric field between them is constant and non-zero? It makes sense if you ...
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Motional emf in a rotating conductor in a uniform magnetic field
Suppose there is a long solid cylindrical conductor of radius $\textbf R$ in a uniform magnetic field of strength $\textbf B_0$, directed along the axis of the cylinder. If the cylinder is rotated ...
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2 votes
1 answer
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How exactly does a capacitor smooth voltage in a AC-to-DC rectifier?
hello, i have just started learning about capacitors and I wanted to clarify my understanding of how exactly a capacitor works to 'smooth voltage' in an AC rectifier circuit, as shown in the diagram. ...
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1 answer
127 views
How to achieve the highest possible voltage with a battery, cables and two identical capacitors? [closed]
I have a battery of voltage U, cables and two identical capacitors of capacitance C. I want to find a way to achieve the highest possible voltage with these components. Please describe how I have to ...
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3 votes
1 answer
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How to intuitively solve this problem? [closed]
Intro: I am not a master of physics and i would love for a person who is better than me at it give me some insights. Problem: There are three uncharged metallic balls of radii $a$, $b$, $a$ ...
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3 answers
176 views
What is loop EMF?
I recently had a lesson on electromagnetic induction and one of the concepts I didn't understand was loop emf. What is the difference between "potential difference" and "emf"? How ...
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1 vote
2 answers
174 views
Negative sign in Voltage definition confusion
This part from Electromagnetic - Field Theory Fundamentals (Guru) has always confused me: This part makes sense, it's just the work done by the field: $ dW_e = {\bf \vec F} \cdot \vec {dl} = q {\bf \...
