All Questions
Tagged with electricity electric-current
112
questions
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756
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How do electric currents make light?
In an incandescent light bulb, electrons flow through wires to the bulb, where is passes through a filament, and the filament lights up.
Does this work because of several high energy electrons losing ...
user143777
1
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3
answers
3k
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Why is the current same after and before passing through a resistor? [closed]
•Why is the current same after and before passing through the resistor ?
•Why is a voltage drop across the resistor ?
Explanation in terms of electron flow and electric field will be really helpful.
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1
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5
answers
2k
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Field inside a wire?
This answer gives a great explanation of why the field inside a wire connected to a battery must be equal at all points: Why doesn't the electric field inside a wire in a circuit fall off with ...
user41086
1
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4
answers
1k
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Current vs voltage in high voltage transmission lines
I know this question has been answered many times, but sadly I'm still not quite sure I get it.
Here's my interpretation, please correct me at any point:
We have some source. There's various ways to ...
- 135
1
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2
answers
21k
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Electron flow and electric potential
In the physics tutorial topic on current electricity it defines the positive terminal as the high potential terminal and the negative as the low potential. When talking about positive test charges ...
user36405
1
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2
answers
8k
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Batteries in series vs parallel
As fa as I understand it, two identicle batteries in parallel will give double the amperage than just one battery and two batteries in series will give double the voltage. If my understanding is ...
- 31
0
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2
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768
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How can current have a value when an ac voltage at a certain moment is zero?
Suppose we have an AC circuit where the current leads the voltage, as in a pure ac capacitive circuit(circuit with ac power supply, capacitor and the ohmic resistance is negligible) for example.
so ...
0
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2
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74
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Is the current obtained using Ohm's law that which passes through the resistor or that which passes through the circuit?
Shouldn't the current passing through a resistor be lesser than that which passes through a circuit?
My understanding is that since Current = Charges/Time. If there exists a resistance to the flow of ...
0
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3
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982
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Why EMF induced in the coil acts to oppose any change in the magnetic flux?
This might be an absurd question for some of you guys.
According to Lenz's Law an induced current will create a magnetic field that induces another current in which it opposes the current causing it ...
user215726
-3
votes
3
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32k
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Why current through all the resistors in series is considered to be same? [duplicate]
Consider the circuit shown, where $R_{1} > R_{2}$. I meant to say that resistance offered by the resistor 1 is greater than the resistance offered by the resistor 2. Keep $t$ constant i,e calculate ...
-3
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1
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11k
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Dependent and Independent Variables in an Electrical Experiment [closed]
So, for my science fair I had to test the gauge of a copper wire vs electrical resistance. What I did was I set up a series circuit involving a 6v battery, a light bulb, a multimeter, and a voltmeter. ...
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39
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5
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If the Earth is a good conductor of electricity, why don't people get electrocuted every time they touch the Earth?
Since the Earth is a good conductor of electricity, is it safe to assume that any charge that flows down to the Earth must be redistributed into the Earth in and along all directions?
Does this also ...
- 1,867
21
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8
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419k
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Why do bulbs glow brighter when connected in parallel?
Consider a circuit powered by a battery. If light bulbs are attached in parallel, the current will be divided across all of them. But if the light bulbs are connected in series, the current will be ...
- 351
10
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3
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2k
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Does an electric current flow in an open circuit?
When the positive and negative terminals of a battery is connected through a wire, an electric current flows across the circuit. Generally, electrons are the ones that flow (from negative terminal to ...
- 167
10
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3
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7k
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How does electricity 'decide' on it's pathway? [duplicate]
I'm struggling to understand the fundamental concepts of electricity, more specifically, the way in which it 'chooses' its optimal pathway.
I appreciate electricity will always choose the path of ...
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