Electronics & Software – Tips & Guide


Do resistors decrease the voltage or amperage in a circuit?

Do resistors decrease the voltage or amperage in a circuit?

it’s a na question? ve. it naively assumes that the generator in the circuit is a source of voltage, like a battery. the source may very well be a source of current, in which case increased resistance increases the voltage.

Generally, the resistors decrease the current because they resist current in any circuit. this fact generally leads to a reduction of the circuit voltages due to the restricted current flow, resulting in a lower differential voltage drop between different elements of a given circuit.

it depends on what drives the current. usually a constant voltage is applied to the circuit – then the current is inversely proportional to the net resistance; but there are also constant current sources (more expensive), in which case the voltage drop on a given resistance will be proportional to its resistance.

the resistors interfere with both the voltage and the current

the main use of the resistor is to restrict the flow of current

but if you connect a resistor in parallel, you will find that it deflects the voltage and is therefore used in the

voltage regulator in serial connection on the resistor. is a voltage drop, infact each component create a voltage drop due to its presence

what resistance? in which circuit?

can not be determined without a specific complete circuit, indicating where the resistor is placed in that circuit. you can easily create a circuit that reacts to the resistance change in the way you want. this could even do both at different levels of a specific resistance.

If all the circuits behaved in the same way, there would be no sense in designing new ones, would not it be necessary to do it?

With all other variables held constant, adding a series resistor to a circuit will decrease the current (amperage). If you add a resistor in parallel with the existing resistance in the circuit, the current will increase.

you get a lot of confusing but mainly correct s because your question is not well defined. that is why I add the sentence with all other variables held constant. in real life, it does not happen. changing one thing always affects all the other things in a circuit, it’s just a question of how and how much.

Here is an example for you that will help you or complicate you.

I could your question by assuming a circuit consisting of a car battery and a resistance of 0.1 ohm. When I put the resistor on the battery and I complete the circuit, the current increases and the voltage (of the battery decreases). a fraction of a second later, the resistor will heat up red and melt into an explosion of sparks.

That’s not what you probably wanted to know. here is what I think you want to know.

resistance resists current (amperes) to flow in a circuit. during this time, a voltage will appear through the resistor. The amount of voltage that appears on the resistor depends on what happens in the circuit that withstands the current. so that a resistance basically decreases the current, not the voltage.

ps for the purest here, my 12-car battery example with a 0.1 ohm load assumes a compact resistor found in common electronic circuits, not a loop of 100-foot 10-gauge copper wire buried in a foot of fresh compacted snow. In this case, you will come back for a 100-foot bobsleigh run for your mouse, ready to use.