# Tag Info

## New answers tagged ohms-law

Accepted

### IR Blaster Resistor Calculation for IR LED (breaking ohm's law?)

The simple answer is, the LED isn't driven with 254mA DC, it's driven with pulses of 254mA. And as the LED datasheet says, it can handle pulses of 1A, when individual ulses are less than 100us, and ...
• 160k

### IR Blaster Resistor Calculation for IR LED (breaking ohm's law?)

The LED isn't driven continuously. It is driven with a 'carrier' (typically 38 kHz) that is lower duty cycle. The LED can tolerate higher currents when pulsed this way. 250 mA peak isn't unreasonable ...
• 55.2k

### Why, when conductors are connected in series, their current strength is equal?

The current through the conductors is going to be determined by the total resistance, which you get by adding together the resistance of each conductor. Moreover, what we see using Ohm's law, is that ...
• 8,865
1 vote

### Why, when conductors are connected in series, their current strength is equal?

Because the electrons have nowhere else to go. If you think about electricity as the physical movement of electrons, then in a DC circuit all of the mobile electrons enter at one end of the two joined ...
• 21.5k
1 vote

### Why, when conductors are connected in series, their current strength is equal?

Perhaps a water pipe analogy is in line. If you have two pipes with different diameters connected in series, will the flow rate (liters/minute, gal/minute) be different in each section if there are no ...
• 10.3k

### Why, when conductors are connected in series, their current strength is equal?

1 amp is equal to 1 colomb's worth of electrons passing a given point in a second. 1 coulomb is about 6x10¹⁸ electrons. If the two wires are in series, then the current in the two must be the same. ...
• 19.5k
1 vote

### Why, when conductors are connected in series, their current strength is equal?

Not only conductors. This logic applies to anything: insulators, vacuum, plasma, whatever. The reason lies in the conservation of charge, which is a principle deeply rooted in physics. The charges ...
• 22.5k

### Do components "draw" current, or is it forced through them?

The real world is complicated. This is why we try to Model it as simply as we can. A model tries to encapsulate the things we are interested in, while excluding, or hiding, or approximating things we ...
• 169k

### Do components "draw" current, or is it forced through them?

However, you can charge your phone with a 1.0A charger, a 2.4A charger, and both work. Your phone doesn't "burn out". Does anyone have a better way to explain it? Here's a water analogy ...
• 36.9k

### Do components "draw" current, or is it forced through them?

You can charge your phone with a 1.0A charger, a 2.4A charger, and both work. Your phone doesn't "burn out." It will burn if you tried to apply too much voltage to it just as an LED burns ...
• 465k

### Do components "draw" current, or is it forced through them?

Ohm's law only applies to 'ohmic' devices. An element (resistor or conductor) that behaves according to Ohm's law over some operating range is referred to as an ohmic device (or an ohmic resistor) ...
• 4,500

### Do components "draw" current, or is it forced through them?

Those are completely different things. They are completely different loads, and you are already mixing voltages and currents. Yes, 9V battery outputs 9V. USB supply to phone outputs 5V. But it is not ...
• 160k

### Do components "draw" current, or is it forced through them?

A 2.4 A charger is capable of supplying 2.4 A, but only if the load consumes it. Similarly, when you plug into your AC power outlet, the load (eg light bulb) consumes power based on its ...
• 19.4k

### Analyzing a circuit with 2 voltage sources

I don't know if this helps, or if it would be an acceptable solution to your professor, but I notice that the circuit is completely symmetrical either side of R3. That means you could split the ...
• 39.6k