DC Circuits Problems

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DC Circuits Problems


SAT Physics questions require knowledge of DC circuits, Ohm's law, resistors, capacitors, Kirchhoff's laws.

1. What is the capacitance between the points A and B if C1 = C2 = C3 = 10-6F?


a) 10-6F
b) 2·10-6F
c) .67·10-6F
d) .5·10-6F
e) 1.5·10-6F

2. A DC voltage source is connected to two resistors in series, as shown in the figure below. What is the ratio between the power dissipation of resistor R1 and the power dissipation of resistor R2?


a) (R1/R2)2
b) (R2/R1)2
c) (1 - R1)/(1 - R2)
d) R1/R2
e) R2/R1

3. A copper wire of length l1 = 6 m and cross-sectional area of A1 = 4 mm2 has the same resistance as a different copper wire of length l2 = 18m. What is the ratio between the masses of the two wires, m1/m2?

a) 9
b) 3
c) 1
d) 1/9
e) 1/3

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