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Q: If resistance goes up how is current affected?
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What law relates to voltage amperage and resistance?

Current is directly proportional to the applied voltage and inversely proportional to the resistance in the circuit. Short form, resistance goes up current goes down, resistance goes down current goes down.This answer is incorrect.First of all, resistance is not affected by a change in voltage or in current. Resistance is only affected by the length, cross-sectional area, and resistivity of the conductor (and, indirectly, by temperature which affects resistivity).Ohm's Law makes no mention of resistance. It simply states that the current flowing in a circuit is proportional to the applied voltage, providing external factors, such as temperature, remain constant.Since current is proportional to voltage, it must be equal to a constant times voltage. This constant is called conductance, which is the reciprocal of resistance, so the so-called 'Ohm's Law formula' is usually shown as I = V/R. But it's important to remember that the resistance, R, is a constant and does not change if V or I changes.

What would happen to the current in a simple circuit if a bulb with a higher resistance were used?

Ohm's law applies: Current = Voltage / Resistance As such if you double the resistance of the light bulb you end up with half as much current.

Why does a heating element get hot when current flows?

The current is doing work against the resistance of the material which makes up the heating element.Because it has resistance.-- Whenever electric current flows through a resistance, it loses energyequal to (current-squared) x (resistance).-- When we connect components in an electrical circuit, we use wire withthe least possible resistance, so as not to lose energy in the wiring.-- When we want to warm up the lab, we use wire with significant resistance,in order to have it dissipate significant energy and radiate heat.

Is power proportional to voltage squared?

Yes, power is directly proportional to current. Power is equal to amps times volts, and as current goes up (with voltage remaining constant), power will go up. Double current, and you'll double power. Cut current in half, and you'll cut power in half. (Voltage stays the same in all this).

What is the link between the thickness of the wire and the current needed to melt a wire?

Well, I am also doing this same question and its all about resistance. Resistance is when the electrons flow around a circuit and they collide with ions. These electrons transfer energy to the ions, which consequently get hot and move more so the resistance increases :) So the thicker the wire is, the less resistance it would have because there are more choices of pathways for the electrons can take without colliding with the ions. Therefore less resistance, more current needed to melt the wire. So the thicker the wire is, the more current is needed to melt it

Related questions

How does resistance effect the flow of current in a wire?

Current is inversely proportional to the resistance of the circuit. Resistance goes up, current goes down. Resistance goes down, current goes up.

As resistance goes up where do current goes?


Explain how changing the resistance in a circuit chages the current?

Ohms' law says if voltage stays constant resistance controls the current flow. Resistance goes up, current goes down. E/I*R.

If current goes down in an electrical circuit and voltage remains the same what will happen to resistance?

v = i*RIf i goes down then R must go up (assuming v remains the same).AnwerCompletely impractical question. Resistance is not directly affected by voltage or current, so what you describe won't happen!

If resistance goes up does current go down?

At constant temp.& pressure,on the same circuit,with potential difference unchanged,current reduces if resistance increases.(Ohm's law).

Why does the skin resistance go down and the current goes up when you lie to a lie detector?

because you sweat.

Why it is said to be negative resistance region?

A negative resistance region is where the current goes up while the voltage goes down, or vice versa. This is a characteristic of the esaki or tunnel diode, when it is in its tunnel region.

What happens when total resistance goes up?

In that case, it is more difficult for charge to flow; the total current will decrease.

A battery connected to a resistor supplies a current of 4 amps. If another resistor of equal resistance is connected in series with first resistor the current the battery supplies will be how much?

Half that, or 2 amps. The basic rule in circuits is that voltage (E) equals current (I) times resistance (R). Here's how that expression of Ohm's law looks: E= I x R That means that current equals voltage divided by resistance, as is shown here: I = E / R This expression says that resistance is inversely proportional to current (with voltage staying the same). Further, if resistance goes up, current goes down. If resistance doubles (goes up by a factor of 2), which it does in the case specified in the question, then current is cut in half (goes down by a factor of 2). Half of 4 amps is 2 amps, and that's where the answer came from.

When resistance goes up voltage goes down?

Ohm's law states that I = V/R, where I is current in amperes, V is difference potential in volts, and R is resistance in ohms. If I goes up, by relation, either V increases or R drops or both occur. Correspondingly, R = V/I, so if V stays static and I increases, R must decrease.?æ

What is the effect of the temperature on the resistance?

It varies. On some items resistance goes up, some it goes down when temperature goes up.

Why the rotor winding of a synchronous motor is usually connected to an external resistance during start up?

because at start the motor draws larger quantity of current and this may affected the rotor windings in order to limit current always resistance is connected.