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What law relates to voltage amperage and resistance?
Ohm's Law relates voltage, current (amperage), and resistance in an electrical circuit. It states that the current flowing through a circuit is directly proportional to the voltage across the circuit and inversely proportional to the resistance of the circuit. Mathematically, Ohm's Law is expressed as V = I * R, where V is voltage, I is current, and R is resistance.
What is the link between the thickness of the wire and the current needed to melt a wire?
Thicker wires have lower resistance, so they can carry more current before heating up and melting. Thinner wires have higher resistance, so they heat up more easily with less current, leading to melting at lower current levels.
Why does the resistance of a filament depend on the current?
The resistance of a filament depends on the current flowing through it because as current flows through the filament, it heats up due to the electrical energy converting into heat energy. This increase in temperature causes the resistance of the filament to increase, resulting in a higher overall resistance in the circuit.
Why do wires usually warm up when an electric current is in them?
Wires warm up when an electric current flows through them due to the resistance in the wire. The resistance converts some of the electrical energy into heat, causing the wire to warm up. This is described by Ohm's Law, which states that the heat generated is directly proportional to the resistance and the square of the current flowing through the wire.
Why does a heating element get hot when current flows?
When current flows through a heating element, it encounters resistance in the material which causes it to dissipate energy in the form of heat. This heat is produced as a result of the collisions between the electrons and atoms in the material, which causes them to vibrate and generate thermal energy.
As resistance goes up where do current goes?
down
How does resistance effect the flow of current in a wire?
Resistance in a wire causes a decrease in the flow of current. This is because resistance impedes the movement of charge carriers through the wire, leading to a reduction in the overall current. Ohm's Law (V = I x R) shows the relationship between voltage, current, and resistance in a circuit.
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.
