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PHYS 112 – Current, Resistance & DC Circuits Practice Test with Answers, Calculations & Detailed Explanations

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Course PHYS 112
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Prepare for PHYS 112 – General Physics II with this 100-question practice test focused on current, resistance, and DC circuits. Topics include electric current, charge flow, Ohm’s law, resistivity, temperature effects, electrical power and energy, series circuits, and parallel circuits. Every question includes the correct answer and a detailed explanation, with worked calculations where needed.

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PASSPOINTPRO




PHYS 112
GENERAL PHYSICS II

CURRENT, RESISTANCE & DC CIRCUITS
100-QUESTION PRACTICE TEST

Answers, calculations & detailed explanations after every question




100 85 A-D
QUESTIONS CALCULATIONS FORMAT




Current • Ohm's Law • Resistivity • Power • Series & Parallel DC Circuits

, FORMULA REFERENCE

I = Q/t | Q = It

Ohm's law: V = IR

Resistance of a uniform conductor: R = rho L/A

Temperature dependence: R = R0[1 + alpha DeltaT]

Power: P = VI = I^2R = V^2/R

Electrical energy: E = Pt

Series: R_eq = R1 + R2 + ...

Parallel: 1/R_eq = 1/R1 + 1/R2 + ...

Two resistors in parallel: R_eq = R1R2/(R1 + R2)

Real battery during discharge: V_terminal = emf - Ir


Coverage: current and charge flow, Ohm's law, resistivity, temperature effects, power and energy, and basic series/parallel DC circuits.




PassPointPro | PHYS 112 - Current, Resistance & DC Circuits Page 2

, 1. 30 C of charge passes a point in a conductor in 3 s. What is the average current?
A. 20 A

B. 5 A

C. 100 A

D. 10 A

Answer: D - 10 A

Explanation: Current is charge flow per unit time: I = Q/t = 30 C / 3 s = 10 A.


2. A steady current of 1.2 A flows for 10 s. How much charge passes through the
conductor?
A. 6 C

B. 120 C

C. 12 C

D. 24 C

Answer: C - 12 C

Explanation: Use Q = It. Q = (1.2 A)(10 s) = 12 C.


3. How long must a current of 0.4 A flow to transfer 6 C of charge?
A. 30 s

B. 150 s

C. 7.5 s

D. 15 s

Answer: D - 15 s

Explanation: From I = Q/t, t = Q/I = 6/0.4 = 15 s.


4. 18 C of charge passes a point in a conductor in 2 s. What is the average current?
A. 18 A

B. 90 A

C. 4.5 A

D. 9 A

Answer: D - 9 A

Explanation: Current is charge flow per unit time: I = Q/t = 18 C / 2 s = 9 A.




PassPointPro | PHYS 112 - Current, Resistance & DC Circuits Page 3

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