Contents
Can a wire have no resistance?
Short version: Yep. That’s what a short circuit is. Typically, you will get current to flow as long as it has a path with finite resistance (even zero), a voltage difference, and a supply of charge carriers (e.g., electrons).
Is wire resistance significant?
Sometimes, a wire is negligible in terms of its resistance. Other times, impacts of the resistance of a wire can become significant.
What would happen if wires had no resistance?
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. Resistance of short wire is in the range of Ohms which is very less as compare to resistors.
When do you ignore the resistance of a wire?
“The resistance of wires is usually so low compared with other devices in a circuit that you can ignore wire resistances when measuring or calculating the total resistance. The exception is when there are large currents. If the current is large, the resistance of wires may be important.”
Is the resistance of a copper wire important?
Internal resistance of a copper wire. “The resistance of wires is usually so low compared with other devices in a circuit that you can ignore wire resistances when measuring or calculating the total resistance. The exception is when there are large currents. If the current is large, the resistance of wires may be important.”
When to ignore the inductive effect of a wire?
• Inductive effects can be ignored if the resistance of the wire is substantial — this is for instance the case for long Aluminum wires with a small cross-section — or if the rise and fall times of the applied signals are slow.
How does the shape of a conductor affect resistance?
Chapter 2.5.1 How the Shape of a Conductor Affects Resistance says the following: The resistance of a conducting wire of a given material varies with its shape. Doubling the length of a wire doubles the resistance, allowing half the current to flow, assuming similar applied voltages.