Questions tagged [basic]
Fundamentals of electricity, electronics, components, or theory
574
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Do components "draw" current, or is it forced through them? [duplicate]
If you attach a typical LED to a 9V battery, the LED will burn out because there's too much current. If you add a resistor, it's fine.
You can charge your phone with a 1.0A charger, a 2.4A charger, ...
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1
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Can you help me understand W=I*V - house load
So I'm trying to work out my daily Ah usage for an off-grid set up (and to see what my power bill at this new place might be like).
Context:
I've gone through and created a sheet with the appliances I ...
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Control Glade Device with AtTiny85
I am a programmer, without knowledge of electronics and I want to be able to make a control that allows:
intervene the power supply in a Glade aromatizing device, so that it is activated only during ...
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How do I use ideal MOSFET model in LTspice? or How do I set voltage in node without voltage source?
I want to simulate the principle of 1T1C DRAM cell. But if I model voltage source in Bit line, bit-line voltage is set by its input signal. So I want to seperate bit line, using ideal MOSFET component,...
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6
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How is he not shocked? [closed]
I'm new to electronics, and I can't make sense of this video. At the 9:10 second mark, he holds a metal spoon across the ends of a wire that's carrying around 100 amps, and he's not harmed. Later the ...
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2
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Confused about usage of Ohm's law & Kirchhoff's laws to solve a circuit
I'm solving this circuit using Ohm's law and Kirchhoff's laws:
I solved the circuit correctly the second time.
Equation A:
$$I_1-I_0-6=0$$
Equation B:
$$-120\ \mathrm{V}+I_0\cdot 10+I_1\cdot 50 = 0$$
...
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2
answers
81
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Understanding reference levels in circuits
I understand that a zener diode uses its anode as a reference to limit the over-voltage levels that appear on its cathode. However, in the circuit shown below, I am confused about why the anode of the ...
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2
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LED Fails to illuminate, what am I not seeing in my configuration(s)?
I'm working on a super simple circuit, I want to light the LED.
Power Source 1: 5.5v from 9v battery through breadboard power supply module
Power Source 2: 5.5v from lab bench PSU
LED Info: Vf - 3v to ...
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2
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109
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Asymmetric LC tank with diodes
Is there a circuit that can produce an asymmetric wave, where some parameters of positive and negative half waves are different, such as voltage amplitude or time?
Intuition says that we need a ...
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7
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Why did current increase when voltage decreased?
I was taking a short course on home electronics (mostly just how to safely change sockets, switches, and bulbs) and the instructor told an anecdote about how when the energy company accidentally ...
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3
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Can you explain why doesn't current always go through the first part of a parallel circuit (without water or heavy math)? [closed]
I have tried to understand this over and over. I don't understand how current ever makes it beyond one branch of a parallel circuit. I apologize for the circuit if it doesn't make sense.
I simply do ...
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8
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598
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How does electricity transfer energy?
I am new to electronics and was just looking for some intuition behind how electrons give energy to components.
I have been attempting to understand this under the condition of voltage being the ...
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2
answers
94
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Connected negative contacts of 2 supplies [duplicate]
When the negative contacts of 2 power supplies are connected with a wire they share the same base potential that can be associated as GND.
But why does this happen? For me it's a bit magical that the ...
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Mix of power supplies
I am struggling to understand what happens when two power supplies are connected:
Both supplies build a whole circuit, the rest of the second supply is left out for simplification
Both power supplies ...
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1
vote
2
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Voltage distribution with two batteries [closed]
I have a question regarding a simple circuit of two batteries (9V) in series with a single resistor connected to the outer contacts to prevent a short.
When I'm simulating this circuit, a current also ...
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