A cylindrical resistor of length 2 cm and diameter of 0.5 cm has a voltage of 1 V applied between the two ends. This voltage results in a current of 2 mA.
a. Find the conductivity of the material from which the resistor is made.
b. Next, the resistor is reshaped so that one half of its length remains the same while the other half has its diameter reduced to 0.2 cm. Find the total resistance.

What should the power status of a circuit be when measuring resistance with an ohmmeter?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.