AP Phys 2 Ch 17/18 Electricity
A
If I₁ goes to the right through R₁, I₂ goes to the right through R₂, and I₃ goes to the right through R₃, what is the resulting equation resulting form applying Kirchoff's junction rule to point B? A) I₁ + I₂ + I₃ = 0 B) I₁ + I₂ - I₃ = 0 C) I₁ - I₂ + I₃ = 0 D) I₁ - I₂ - I₃ = 0
A
If R₁ < R₂ < R₃ and if these resistors are connected in parallel in a circuit, which one has the highest current? A) R₁ B) R₂ C) R₃ D) All have the same current
A
If one doubles the emfs in a circuit and doubles the resistances in the circuit at the same time, what happens to the currents through the resistors? Assume there are only emfs and resistors in the circuit. A) They stay the same B) They double C) They quadruple D) They halve
C
Kirchoff's rules are the junction and the loop rule. Which of the following statements is true? A) Both rules are based on the conservation of charge B) Both rules are based on the conservation of energy C) The junction rule is based on the conservation of charge, and the loop rule is based on the conservation of energy D) The junction rule is based on the conservation of energy, and the loop rule is based on the conservation of charge
D
The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning the behavior of the system is not changed when using the meter): A) zero and zero B) infinite and infinite C) zero and infinite D) infinite and zero
C
The two ends of a 3.0 Ω resistor are connected to a 9.0 V battery. What is the current through the resistor? A) 27 A B) 6.3 A C) 3.0 A D) 0.33 A
A
Three resistors connected in parallel each carry currents labeled I₁, I₂, and I₃. Which of the following expresses the value of the total current I in the combined system? A) I = I₁ + I₂ + I₃ B) I = (1/I₁ +1/I₂ + 1/I₃) C) I = I₁ = I₂ = I₃ D) I = (1/I₁ +1/I₂ + 1/I₃)⁻¹
C
Three resistors connected in series each carry currents labeled I₁, I₂, and I₃. Which of the following expresses the value of the total current I in the system made up of the three resistors in series? A) I = I₁ + I₂ + I₃ B) I = (1/I₁ +1/I₂ + 1/I₃) C) I = I₁ = I₂ = I₃ D) I = (1/I₁ +1/I₂ + 1/I₃)⁻¹
A
Three resistors connected in series have individual voltages labeled ∆V₁, ∆V₂, and ∆V₃, respectively. Which of the following expresses the value of the total voltage ∆V taken over the three resistors together? A) ∆V = ∆V₁ + ∆V₂ + ∆V₃ B) ∆V = (1/∆V₁ + 1/∆V₂ + 1/∆V₃) C) ∆V = ∆V₁ = ∆V₂ = ∆V₃ D) ∆V = (1/∆V₁ + 1/∆V₂ + 1/∆V₃)⁻¹
A
Three resistors, each with resistance R₁, are in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true? A) The current through R equals the current through R₁ B) The voltage across R equals the voltage across R₁ C) The power given off by R equals the power given off by R₁ D) R is less than R₁
A
Two resistors of values 6.0 and 12.0 Ω are connected in parallel. This combination in turn is hooked in series with a 4.0 Ω resistor and a 24 V battery. What is the current in the 6 Ω resistor? A) 2.0 A B) 3.0 A C) 6.0 A D) 12 A
B
When a 24.0 Ω resistor is connected across a 12.0 V battery, a current of 482 mA flows. What is the internal resistance of the battery? A) 0.02 Ω B) 0.9 Ω C) 25.0 Ω D) 49.8 Ω