Can You Have Zero Resistance?

Does a short circuit have 0 resistance?

In circuit analysis, a short circuit is defined as a connection between two nodes that forces them to be at the same voltage.

In an ‘ideal’ short circuit, this means there is no resistance and thus no voltage drop across the connection..

Do all wires have resistance?

So you can see that resistance is inherent in every type of wire. There are cases when some materials can be cooled down to very temperatures where they have effectively zero resistance, but in everyday encounters electricity this, effect doesn’t really have much bearing.

Does temperature affect resistance?

Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. … Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.

How many ohms is considered an open circuit?

An open circuit implies that the two terminals are points are externally disconnected, which is equivalent to a resistance R=∞ . This means that zero current can flow between the two terminals, regardless of any voltage difference.

What are the effects of a circuit with high resistance?

The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.

What happens if there is no resistance?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage). That final energy is usually what is dissipated as heat or other types of energy by the circuit.

Does higher resistance produce more heat?

When current flows through a conductor, heat energy is generated in the conductor. … The resistance, R of the conductor. A higher resistance produces more heat. The time, t for which current flows.

Does thick or thin wire have more resistance?

The relationship between resistance and wire length is proportional . The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. The relationship between resistance and the area of the cross section of a wire is inversely proportional .

Can you eliminate resistance in a circuit?

Practically , you can never have zero resistance. Practically, it would depend on your power source. However , just for the sake of an answer , assuming zero resistance and applying ohms law, I = V /R; You get a divide by zero.

What would decrease the resistance of a wire?

Thicker wires have a larger cross-section that increases the surface area with which electrons can flow unimpeded. The thicker the wire, therefore, the lower the resistance.

What type of wire has the least resistance?

SilverSilver has the lowest resistivity. That means for a given length and diameter of wire it will also have the lowest resistance. But its not used for wire very often because its only marginally better and it is expensive and corrodes easily. What causes resistance of a current through a wire?

What does a reading of 0 ohms mean?

A measurement of Zero, or very close to zero (less than .5 OHM) indicates a very low resistance to current flow. Applying voltage to this low level of resistance will result in extremely high current flow.

Do resistors increase resistance?

In a series circuit, adding more resistors increases total resistance and thus lowers current. But the opposite is true in a parallel circuit because adding more resistors in parallel creates more choices and lowers total resistance. If the same battery is connected to the resistors, current will increase.

How many ohms is considered a short?

Very low resistance — about 2 ohms or less — indicates a short circuit.

Does resistance depend on material?

The resistance of an object (i.e., a resistor ) depends on its shape and the material of which it is composed. Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.