Power: The power rating of a 400-? resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?
A. 10 V
B. 20 V
C. 30 V
D. 40 V
E. 50 V
Answer: A
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Specific Heat: If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of heat was added to it, which of the following quantities would be most helpful to know?
A. initial temperature B. specific heat C. density D. coefficient of linear expansion E. thermal conductivity
Two resistors of values 6.0 and 12.0 W are connected in parallel. This combination in turn is hooked in series with a 4.0-W resistor and a 24-V battery. What is the current in the battery?
a. 12 A c. 2.0 A b. 3.0 A d. 6.0 A
An inductor has a current I(t) = (0.500 A) cos[(275 )t] flowing through it. If the maximum emf across the inductor is equal to 0.500 V, what is the self-inductance of the inductor?
A) 4.37 mH B) 3.64 mH C) 2.75 mH D) 0.73 mH E) 1.43 mH
A visual physical model for Ohm's Law uses a wood board with nails in it and metal balls. The nails in a board represent a fixed amount of electric resistance in a wire
As the metal balls roll through the nail obstacle course, they run into nails and bounce in various directions. The balls represent the charge carriers in a current; the greater the speed of the balls running through the nails, the greater the current represented. The electric potential energy difference between the ends of the wire is represented by the tilt of the board, because a greater tilt represents a greater difference in gravitational potential energy. Explain how this analogy works.