Sage-Tips

How does the resistance of a material determine how much electric current flows through it?

Factors That Affect Resistance All materials have some resistance, but certain materials resist the flow of electric current more or less than other materials do. In a similar way, more current can flow through a wide wire than a narrow wire. A longer wire has more resistance than a shorter wire.

How does resistance work with wires?

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. The resistance of a conductor, or circuit element, generally increases with increasing temperature.

What happens if a cable has high resistance?

If a circuit has excessive resistance, it prevents the wire or component from carrying sufficient current under high load conditions. Resistance can be caused by corrosion, loose wiring pins, pitted relay contacts, and other types of physical damage.

How does the length of a high resistance wire affect the flow of current through the circuit?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. When all other variables are the same, charge will flow at higher rates through wider wires with greater cross-sectional areas than through thinner wires.

Does resistance change with current?

Current is inversely proportional to the resistance. A threefold increase in the resistance would cause a threefold decrease in the current.

What is resistance also mention all the factors in detail that affect resistance?

Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material.

Do wires have no resistance?

One final note: for most practical purposes, wire conductors can be assumed to possess zero resistance from end to end. In reality, however, there will always be some small amount of resistance encountered along the length of a wire, unless it’s a superconducting wire.

Do all wires have some 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.

Which symptoms is most likely to occur with a high resistance fault?

Effects. The most common effect of a high resistance connection will be localised heating around the connection. On a high current circuit even a small unwanted resistance (of the order of an ohm) can result in the dissipation of hundreds of watts of power at the joint.

What 4 factors affect the resistance of a wire?

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.