Quick Answer: Can Current Flow Without Resistance?

Does current flow through least resistance?

In electrical circuits, for example, the current always follows all available paths, and in some simple cases the “path of least resistance” will take up most of the current, but this will not be generally true in even slightly more complicated circuits..

Why does resistance oppose current?

Resistance is the property of a material by virtue of which it opposes the flow of electrons through the material. It restricts the flow of the electron through the material. These moving electrons collide with each other and hence opposes the flow of electrons. …

Does more resistance mean less current?

The circuit with the higher resistance will allow less charge to flow, meaning the circuit with higher resistance has less current flowing through it.

What is the relation between resistance and current?

Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r. The current is directly proportional to the voltage and inversely proportional to the resistance.

What happens when a current flows in a material with non zero resistance?

If is non-zero, and is zero, then the current will be infinite. … If there’s zero resistance, as in some kinds of short circuits, the current will flow in the wire without any losses. The basic rule is Ohm’s Law: If is non-zero, and is zero, then the current will be infinite.

What are four factors that determine resistance?

There are 4 different factors which affect resistance:The type of material of which the resistor is made.The length of the resistor.The thickness of the resistor.The temperature of the conductor.

Why do electrons take the path of least resistance?

Electrons follow the path of least resistance in the same way that water flows downhill. The electrons do not act collectively, each individual electron is driven away from other electrons, and driven toward positive charges.

How does electricity know if you’re grounded?

If you hook the case of a metal box that contains electrical parts at various voltages to the ground, then there is no way for electricity in the box to accidentally charge up the box and make a voltage difference between the box and the ground, which makes it safe to touch the box.

Can you have zero resistance?

Possible it is! The state of zero electrical resistance is called superconductivity, and it can be induced in many materials by cooling them to very low temperatures. … The state of zero electrical resistance is called superconductivity, and it can be induced in many materials by cooling them to very low temperatures.

Do wires have resistance?

An electric current flows when electrons move through a conductor, such as a metal wire. … This makes it more difficult for the current to flow, and causes resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.

What is considered high resistance?

Conductors: Materials that offer very little resistance where electrons can move easily. Examples: silver, copper, gold and aluminum. Insulators: Materials that present high resistance and restrict the flow of electrons. Examples: Rubber, paper, glass, wood, and plastic.

Does electricity always take shortest path?

Electricity does take low-resistance paths, including the one of least resistance. But it also takes every other path available to it. You can’t suspend Ohm’s Law and Kirchhoff’s Law by driving 10 ft of copper-clad steel into dirt.

Do LEDs have resistance?

The long answer: LEDs are semiconductors, diodes in particular. … Current versus voltage is a straight line for a resistor, but not at all for an LED. Because of this, you can’t say that LEDs have “resistance.” Resistance is defined as the constant ratio of voltage to current in a resistive circuit element.

How do I calculate resistance?

Ohms Law and PowerTo find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

What happens to the batteries if there is not enough resistance in the circuit?

Ideally, if there is no resistance ,i.e, short circuit is connected across an dc source, infinite current will flow as I=V/R, and R=0. Practically, if you connect a wire directly across a battery, it will start heating. … All connecting wires and inductors offers little resistance and every cell has internal resistance.

How does electricity know the path of least resistance?

Electricity, when choosing a path, will take the path of least resistance. It doesn’t ALL choose to flow through the lower resistance because electrons repel each other, so some flows through the higher resistance, proportional to the rule for parallel circuits. … It takes the path of least resistance.

What happens if resistance is too high?

If resistance is too high, current will be low if voltage is okay. NOTE: When the voltage stays the same, such as in an Automotive Circuit… current goes up as resistance goes down, and current goes down as resistance goes up. Bypassed devices reduce resistance, causing high current.

Does resistance depend on voltage?

Resistance is an intrinsic property of any material. It does not depend in the input voltage, as long as the voltage is in the range of application. However when voltage is applied across a ‘resistor’ (say) it would constitute a current. … According to the temperature coefficient of the resistor, the resistance may vary.