Q:

How does temperature affect the resistance of a wire?

A:

Quick Answer

The resistance of a typical conducting wire is low when temperature is low and high when temperature is high. The increase in resistance alongside temperature is due to an increase in energy of the wire atoms, which cause them to vibrate more and impede the path of the electrons flowing through.

  Know More

Full Answer

A good example of resistance changing with respect to temperature is a standard light bulb. At first, while it is completely cool, very little light is produced. As the filament heats up, the resistance increases, which in turn produces more heat and more light. If temperatures are low enough, certain materials can approach zero resistance, called superconductors.

Learn more about Electricity

Related Questions

  • Q:

    What happens to the current in a short circuit?

    A:

    When a short circuit occurs, electrical current experiences little to no resistance because its path has been diverted from its normal direction of flow. This in turn produces excess heat and can damage or destroy an electrical appliance. It can also create a fire hazard and an electrical shock hazard if left unattended

    Full Answer >
    Filed Under:
  • Q:

    What is the current divider rule?

    A:

    The current divider rule states that the portion of the total current in the circuit that flows through a branch in the circuit is proportional to the ratio of the resistance of the branch to the total resistance. This rule allows for a shortcut in determining the branch current in a parallel circuit, which is simply to multiply the ratio of the resistances by the total current.

    Full Answer >
    Filed Under:
  • Q:

    How does a shunt resistor work?

    A:

    A shunt resistor works by measuring either direct or alternating current that flows in an electrical circuit through the voltage drop that is generated across the resistance. Also known as a current shunt or ammeter shunt, this precision device uses the principle of Ohm's Law, which is mathematically represented by the equation V = I x R, where "V" indicates voltage, "I" denotes current and "R" is resistance. The standard units for voltage, current and resistance are volts, amps and ohms, respectively.

    Full Answer >
    Filed Under:
  • Q:

    What is the time constant of an RC circuit?

    A:

    The RC time constant is the product of the resistance and capacitance of a circuit, or R x C. It is used to describe the rate of charging when a battery is connected to a resistor and capacitor in series. RC circuits can effectively function as timers.

    Full Answer >
    Filed Under:

Explore