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Why can you ignore the resistances of wires in circuits with lower current?
Actually, it depends on the resistance of the other components in the circuit, and not so much on whether or not the total circuit current is low or not. Often, conductor resistance is ignored because it is so much lower than the active components that it does not matter. In a circuit with low resistance components, however, conductor resistance can be important, even if the total current is relatively low, because the voltage drop over the wire becomes a significant part of the overall circuit. To answer the specific question, even though its slightly misleading, conductor resistance does tend to become important in high current circuits because the voltage drop over the conductor (Ohm's Law: Voltage is current times resistance) can become high. Even in high current circuits, however, if the conductor is substantially less resistive than the components, the tendency is still to ignore it, except that you have to account for heating of the conductors along with heating of the components.
How do you calculate current in a series circuit?
voltage over resistance/impredance. V / I * R V= Voltage I= Current R= Resistance or Impedance Cover what you want to know and the way the other two are laid out gives you your equation.
How the thickness of transmission lines reduce resistance?
The electrons in a wire travel mostly along the outside of the wire and hence the bigger the circumference the more surface area decreasing the resistance. An analogy is a vat of water with a valve at the bottom. Imagine that the water is a store of electrons creating a potential or voltage. If you only open the valve a little, the water will flow out of the vat slowly and hence the higher the resistance. As you open the valve further there is less resistance and more water can flow.
What is the value of current in a series when one resistor is open?
Since it is a series circuit with only one path for current, an open anywhere along that single path will cause current flow to be 0 amps.
What is the significance of the constant temperature reference in ohms law?
As temperature affects resistivity, the resistance of a conductor may change if its temperature is allowed to increase. For pure metal conductors, the resistance generally increases as the temperature increases.Ohm's Law ('the current flowing along a conductor, at constant temperature, is directly proportional to the potential difference across that conductor') only applies when the resistance of the conductor is constant so, when verifying Ohm's Law, the temperature must be kept constant, in order to keep the resistance constant.It should be pointed out that the ratio of voltage (U) to current (R) is called resistance (R), and the resistance of a circuit can be found from the equation, R = U/I whether Ohm's Law applies or not -but Ohm's Law itself only applies when the ratio is constant over a range of voltage variation.
Will current travel along the path with the highest resistance?
Current goes path of least resistance. But if u have two resistances in paralell only the majority will go through the smaller resistance some Porportional Amount will "flow" through the larger resistor. Depends on resistance sizes and voltage slap plied as to how much current
What path do electricity travel along?
Lowest resistance.
Does current depends on its resistance?
The current flow in an electrical circuit depends on the applied electromotive force (EMF, measured in volts), and the total resistance along the entire circuit. Rising EMF or dropping resistance cause increased current flow
What determines the flow of electricity along the path of least resistance?
Electricity flows along the path of least resistance due to Ohm's Law, which states that current will follow the path with the least resistance. This means that the flow of electricity is determined by the resistance of the material through which it is passing.
What does the slope of voltage-current curve represent?
It depends. If voltage is drawn along the horizontal axis, then the slope at any point on the graph represents the reciprocal of resistance at that point. If current is drawn along the horizontal axis, then the slope at any point on the graph represents the resistance at that point.
Reducing the current you a circuit causes what?
Reducing the current to a circuit causes a higher resistance -- assuming constant Volts. Also, reducing the current to a circuit causes lower Volts -- assuming constant resistance.AnswerAltering the current has absolutely no effect on a circuit's resistance. Reducing the current will reduce line losses (I2R) and reduce the voltage drop along a conductor.
What large surface current runs along the east coast of the United States and what direction does it travel?
Coriolis effect
Why do you always speak about voltage drop and not current?
Voltage is like the pressure in your hose pipe. Current is the flow of charge and equivalent to the rate of flow of the water. Due to resistance to the water in the pipe,the pressure of the water will reduce along the length of the pipe but the quantity of litres flowing in the pipe will not change. So voltage will be maximum at the source of the voltage but as you move along the conductor there is voltage drop due to the resistance of the conductor.However, the current is same at all points along the conductor (the flow of charge is uniform at all points)
Why resistance drop occurs in a conductor?
All conductors have some amount of resistance associated with them. There is voltage drop along the length of a conductor because the potential energy of the voltage is lost to heat losses (I^2 *R) due to this resistance. The more resistance, the more voltage drop. The current is set at a given voltage and power level.
How does a rheostat work?
A rheostat is simply a variable resistor. It is engineered so a "wiper" travels along the resistor carbon path. There is minimum resistance at one end of the path, and maximum resistance (what maximum value the engineers made into it) at the other end. Rheostats come in many values such as "0 to 1000 ohm", 0-1000 ohm, 0-10,000 ohm, and etc., all the way up to mega-ohm values. Some are designed to work on 0-5 watts, 0-20 watts, or larger power versions with resistance wire in them.
What instrument used to measure alternating current?
A multimeter has the ability to measure both AC and DC current along with voltage and resistance.
Why are two wires used to allow electric current to flow instead of a single one?
Because the current must always travel in a complete loop, going through the circuit and returning to the supply. A current can't travel along only one wire so no power would get to the circuit unless it has two wires.
