Barb E. Dahl's hair dryer has a resistance of 9.00 Q when first turned on. How much current does the hair dryer draw from the 110 V line
in Barb's house? What is the power while the hair dryer is running? If the hair dryer runs for 2 minutes, how much energy is used?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

What is the equation for electrical work?