MBL-21RL Circuits

Nov.11, 1997
Questions to answer as homework for Thursday:
HW-21
1.How does the behavior of this circuit compare to an RC circuit?
the same and how are they different?
How are they
IMAGE imgs/HW-2101.gif
  1. Knowing the units of R and L and using dimensional analysis, can you predict
    a relation between R and L that will result in a time value (units of seconds)?
    Justify your prediction. Using this prediction, theoretically predict the half-life
    time for this circuit. How does it compare to the experimental value you
    measured?
  2. Describe the current buildup process for an R-L circuit [see the Fig. HW-21], and
    the associated time constant,     t. (a) If the coil has an inductance of 1.5H and a
    resistance of 0.6    W, and the coil is suddenly connected across a 12-V battery, find
    the time required for the current to rise to 0.63 of its final value. (b) What will
    be the final current through the coil?
IMAGE imgs/HW-2102.gif
Print out answers to these questions to hand-in at the beginning of class on
Thursday.