46. Which one of the following statements regarding ac circuits is correct?
A. Current and voltages are in phase through a resistor
B. Current leads the voltage through a resistor
C. Current lags the voltage through a resistor
D. All of the above
E. None of the above
47. Which one of the following statements most accurately describes the nature of inductive reactance?
A. Inductive reactance is an opposition to current flow in dc circuits
B. Inductive reactance is an opposition to current flow in ac circuits
C. Inductive reactance is another term for counter emf
D. Inductive reactance is a force that tends to overcome the effects of counter emf
E. None of the above
48. What are the main parts of an atom?
A. Protons only
B. Electrons, protons, and ions
C. Electrons, ions, and neutrons
D. Electrons, protons, and neutrons
E. None of the above
49. Current is
A. The flow of charged particles through a material
B. An imbalance of electrical charges
C. The force that causes electrons to flow
D. The number of free electrons in an atom
E. None of the above
50. A real voltage source has
A. Zero internal resistance
B. Infinite internal resistance
C. A small internal resistance
D. A large internal resistance
E. None of the above