Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).
2
votes
2answers
120 views
Why don't AC transformers burn up
I marginally familiar with the way that an AC transformer works. After viewing this question:
Why don't all motors burn up instantly?
It got me thinking about the same thing with AC ...
0
votes
3answers
84 views
Choosing “widespread” parts
Many times I know the parameters of a part to choose and find hundreds of them, but I don't know which ones I would have to order, which ones I am likely to found in a local electronic parts store, ...
0
votes
0answers
42 views
High current SMPS transformer
I would like to have some tips concerning DIY winding of SMPS transformers.
Let's consider the following example (for reference only):
Input: rectified 230V AC (mean value: 310V DC on the DC-link ...
2
votes
1answer
62 views
Current Transformer giving a reading when not clamped around a wire
A split core current transformers is currently clamped around a live wire. One end of the transformer's output wires are connected to the analog pin of an Arduino and the other end has a 2.5V bias ...
0
votes
2answers
52 views
Basic question regarding power consumption of different devices
I have current values for devices measured at different DC voltages.
4.2mA at 2.4V
68.8uA at 3.0V
44mA at 2.0V
65mA at 3.4V
If I were to power them at a voltage of 3.6V and would like to ...
0
votes
1answer
50 views
How multimeters measure current in this circuit? [duplicate]
simulate this circuit – Schematic created using CircuitLab
In the circuit shown if current is flowing from negative side of battery to positive side
how multimeter can know the existence ...
0
votes
2answers
82 views
How current gets divided?
I was wondering when we connect two led's in a parallel mode how current gets divided between them?
0
votes
2answers
61 views
Will this relay handle my current and voltage requirements?
I have this relay: SONGLE SRA-24vdc-cl
I want to use it to run 240V 11A device.
I can see in the datasheet it can be up to 20A (section 7, line 4-5), but the relay is so small and its legs so ...
4
votes
6answers
969 views
Over 10,000 amps?
Is it possible to have a 5 meter wire that has 10,000 amps or more current flowing?
I assume this can be done with a step-down transformer and the voltage could be 2V and lower... I assume that most ...
0
votes
2answers
51 views
How to sink current to drive 7-segment LED using a 4026 chip?
Am referring to this project here;
http://electronicsclub.info/p_random.htm
with a schematic like so;
Key points:
Resistors are not required for the LEDs because the 4026 IC limits the current to ...
15
votes
3answers
2k views
Why don't all motors burn up instantly?
A motor rated for 3S (11.1 V) has an internal resistance of 0.12 ohm. The maximum current is 22 A.
11.1 V / 0.12 ohm = 92.5 A
Doesn't this mean ...
2
votes
2answers
84 views
Why are some terminal blocks blue and grey in color
Looking at some terminal blocks like the one below, why are the top level positions color coded blue while the middle ones are in grey? I understand yellow-green are for ground connections. I am ...
1
vote
4answers
155 views
Highly accurate constant current source
I want a continuous and highly stable light from an LED for around a couple of hours, for which I need a highly constant and highly stable current source. I prefer an opamp-based circuit for the same. ...
0
votes
2answers
43 views
Is the LT8500 a current source or sink on its PWM outputs?
I am using the LT8500 as an LED driver and I need to know if the leds are current sink or source.
Also if I need to have resistors in serial with the PWM outputs since the output voltage is 4V.
I've ...
0
votes
1answer
67 views
How to calculate maximum allowable signal swing at the collector?
How to calculate maximum allowable signal swing at the collector?
How does change in beta value change the swing at both ends?
