#4. For current to flow, all of the following must be present except: A) A charge conduction pathway. B) Free protons. C) A potential difference. D) Free electrons. O A

A current of 2.2 A flows through a lightbulb. (*) How many coulombs of charge flow through the lightbulb in 45 min? (**) This is equivalent to how many electrons? 7. charge А. 6304 C D. 7205 C В. 5794 C E. 6935 C С. 4669 C F. 5940 C |--/ 8. electrons D. [2.87E+22] E. [3.124E+22] F. [3.713E+22] А. [2.91E+22] В. [3.689E+22] С. [ 3.254E+22] |--/

9. A capacitor of 5000 µF is charged by a 12 V supply and then discharged through a 150 Q resistor. Calculate (a) its initial charge, (b) the time constant (c) the charge remaining after 1.5 seconds.

2 What is the SI unit of resistance? A Ω V F In solid metals, which charged particles are free to move throughout the object? Select any/all correct answers. protons neutrons electrons 4 Which factor(s) affect the current in a conductor? Select any/all correct answers. cross-section area density of the charged particles drift speed of the charged partiçles