Current and Resistance

Key Questions

  • What is Ohm's law?

    Answer:

    V = I * R or other forms...

    Explanation:

    Ohm's law describes the relationship between voltage, current and resistance.

    It can be expressed in the form: V = I * R where V is the voltage (measured in volts), I the current (measured in amperes) and R the resistance (measured in ohms).

    This is also expressible in the VIR triangle:

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    which can be read as:

    V = I * R

    I = V / R

    R = V / I

    George C. · 1 · Mar 12 2018
  • How does resistance change with thickness of the wire?

    A thicker wire (of the same material) has lower resistance.

    Having a thicker wire means that the volume of conducting material has increased so there are more conduction electrons available.

    A concrete example of this point would be consider the current that flows through a wire. Now take a second identical wire and set it parallel with the first. The current that flows through the parallel combination would be larger (by a factor of two). Therefore the resistance of that arrangement must be less than the single wire (half the resistance of the single wire).

    Daniel W. · · Jul 14 2014

Questions

Electrical Energy and Current