physics ch 26

25 V

A 100-V DC signal is applied to a series circuit composed of four equal resistors 10 Ω each. What is the voltage across each resistor? A) 15 V B) 25 V C) 50 V D) 20 V E) 10 V

42 V

A 14-A current flows into a series combination of a 3.0-Ω and a 4.0-Ω resistor. What is the voltage drop across the 4.0-Ω resistor? A) 42 V B) 38 V C) 56 V D) 24 V E) 98 V

3 Ω

A 6-Ω resistor, an 8-Ω resistor, and a 24-Ω resistor are connected together. What is the minimum resistance that can be produced using all three resistors? A) 7 Ω B) 4 Ω C) (1/6) Ω D) (1/24) Ω E) 3 Ω

infinite

An ideal voltmeter is one that does not change the behavior of a circuit when it is properly used to measure potential difference. The internal resistance of such a meter is A) dependent on the circuit. B) infinite. C) 0 Ω. D) the same resistance as the circuit. E) cannot be determined

decreases.

As more resistors are added in series to a constant voltage source, the power supplied by the source A) increases. B) decreases. C) increases for a time and then starts to decrease. D) decreases for a time and then starts to increase. E) does not change.

The total resistance is more than the largest resistor.

Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit? A) The total resistance is less than the smallest resistor. B) The total resistance is equal to any one of the resistors. C) The total resistance is less than the largest resistor. D) The total resistance is more than the largest resistor. E) The total resistance is equal to average of the four resistors

the same voltage and twice the total charge that one battery would.

If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide A) twice the voltage and the same total charge that one battery would. B) twice the voltage and twice the total charge that one battery would. C) the same voltage and twice the total charge that one battery would. D) half the voltage and half the total charge that one battery would. E) half the voltage and the same total charge that one battery would.

12 V

Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors? A) 36 V B) 24 V C) 4 V D) zero E) 12 V

4V

Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors? A) 24 V B) 4 V C) zero D) 36 V E) 12 V

E = 9 V, r = 2 Ω

When a 100-Ω resistor is connected to a battery of emf E and internal resistance r, the battery delivers a power P= 0.794 W. When a 200 Ω resistance is connected to same battery it delivers apower P = 0.401 W. What are the emf and internal resistance of the battery? A) E = 18 V, r = 4 Ω B) E = 12 V, r = 6 Ω C) E = 10 V, r = 5 Ω D) E = 4.5 V, r = 4 Ω E) E = 9 V, r = 2 Ω

0.51 Ω

When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the terminal voltage of the battery falls 0.30 V. What is the internal resistance of this battery? A) 0.51 Ω B) 1.56 Ω C) 3.60 Ω D) 0.98 Ω E) 0.30 Ω

all of the given answers

When two or more resistors are connected in parallel to a battery, A) the total current flowing from the battery equals the sum of the currents flowing through each resistor. B) the voltage across each resistor is the same. C) the equivalent resistance of the combination is less than the resistance of any one of the resistors. D) all of the given answers E) none of the given answers

The 50-W bulb glows more brightly than the 100-W bulb

You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct? A) The 50-W bulb glows more brightly than the 100-W bulb. B) Both bulbs glow at the same increased brightness. C) The 100-W bulb glows more brightly than the 50-W bulb. D) Both bulbs glow at the same reduced brightness.

0.20 A

in series with a 9.0-V battery and a 20-Ω resistor, what is the current through the 15-Ω resistor? A) 0.32 A B) 0.20 A C) 0.26 A D) 0.10 A E) 0.13 A