physics chapter 18/19: current and electric circuits

the resistance in a constant voltage circuit is doubled. How does the power dissipated by that circuit change?

1/2 as much

a 10,000 ohm resistor is placed in series with a 100 ohm. In the 10,000 ohm resistor the current is 10 A. if the resistors are swapped, how much current flows through the 100 ohm resistor?

10 A

a 9-V battery is hooked up to two resistors in series. One has a resistance of 5 Ω, and the other has a resistance of 10 Ω. Several locations along the circuit are marked with letters, as shown in the figure. through which resistor is energy being dissipated at the higher rate?

10 ohm resistor

a wire of resistivity ρ must be replaced in a circuit by a wire of the same material but four times as long. if, however, the total resistance is to remain as before, the diameter of the new wire must be _____.

two times the original diameter

three identical resistors are connected in series to a standard 120V dc household outlet. when a fourth resistor is added in series, what happens to the potential difference across R1?

decrease

three identical resistors are connected in series to a standard 120V dc household outlet. when a fourth resistor is added in series, what happens to the current in R1?

decreases

as more resistors are added in parallel across a constant voltage source, what happens to the power supplied by the source?

increase

as more resistors are added in parallel across a constant voltage source, the power supplied by the source

increases

as more resistors are added in parallel across a constant voltage source, what happens to the power supplied by the source?

increases

three identical resistors are connected in parallel to a standard 120V dc household outlet. when a fourth resistor is added in parallel, what happens to the current in R1?

increases

which statement(s) is/are true when current flows through a resistor? A) some of the current is used up by the resistor B) some of the charge is used up by the resistor

neither

three identical resistors are connected in parallel to a standard 120V dc household outlet. when a fourth identical resistor (R4) is added in parallel, what happens to the potential difference across R1?

stays the same

the unit kilowatt-hour is a unit of

the amount of energy

four unequal resistors are connected in parallel with each other. which statement is true?

the equivalent resistance is less than that of the smallest resistor.

four unequal resistors are connected in series with each other. what is true?

the equivalent resistance is more than the largest resistance.

when different resistors are connected in parallel across an ideal battery, we can be certain that _____.

the potential across each is the same

when different resistors are connected in parallel across an ideal battery, we can be certain that

the potential difference across each is the same