(a) What is the terminal voltage of a large 1.50-V carbon-zinc dry cell used in
ID: 1594348 • Letter: #
Question
(a) What is the terminal voltage of a large 1.50-V carbon-zinc dry cell used in a physics lab to supply 1.40 A to a circuit, if the cell's internal resistance is 0.200 ??
______ V
(b) How much electrical power does the cell produce?
____ W
(c) What power goes to its load?
____ W
2) Find the total capacitance of the combination of capacitors shown in the figure below.
(C1 = 2.52 µF,
C2 = 21.2 µF.)
3) In the circuit below, the currents through the four resistors are as indicated. Use the junction rule to write the equations representing the relationship between the currents at the point c. (Use the following as necessary: I1, I6,and I2.)
Explanation / Answer
(a)
Terminal voltage = (e.m.f. of cell) - (potential difference across internal r)
Terminal voltage = 1.50 - (1.40 * 0.2) V
Vt = 1.22 V
(b)
Total power = v * i
P = (1.50 * 1.40)
P = 2.1 W
(c) Power to the load = [Terminal voltage] * i
PL = 1.22 * 1.40
PL = 1.71 W
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