A 4 volt battery moves 27 Coulombs of charge in 2.6 hours. What is the power?
The diameter of a copper wire is 5.5 mm, and it carries a current of 76 amps. What is the drift velocity if copper has a density of 8.8E3 kg/m3 and an atomic mass of 63.54 g/mol? (1 mol = 6.02E23 atoms, and copper has one free electron per atom.)
A 168 Watt DC motor draws 0.3 amps of current. What is effective resistance?
A power supply delivers 113 watts of power to a 104 ohm resistor. What was the applied voltage?