Physics Physics Practice Problems Solutions Library

Resistors and Ohm's Law Solutions Library

Access 43 Resistors and Ohm's Law video and text solutions to help you complete your homework. Need to revisit the concept? Watch our Resistors and Ohm's Law learn videos.

Browse Solutions

43 solutions

Resistors and Ohm's Law

Q. If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected?Select one:a. The voltage is r...

Solved • Jul 30, 2020

Resistors and Ohm's Law

Q.  If the voltage across a circuit of constant resistance is doubled, how is the current in the circuit affected?Select one:a. The current is doubled...

Solved • Jul 30, 2020

Resistors and Ohm's Law

Q. Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the tw...

Solved • Jul 30, 2020

Resistors and Ohm's Law

Q. Which of the following statements are true? More than one answer may be correct - select all correct answers.Select one or more:a. A material that ...

Solved • Jul 30, 2020

Resistors and Ohm's Law

Q. Which of the following will increase the resistance of a wire? (More than one answer may be correct - select all correct answers).Select one or mor...

Solved • Jul 30, 2020

Resistors and Ohm's Law

Q. In household wiring, copper wire 2.05 mm in diameter (12 gauge) is often used. Find the resistance of a 24.0 m length of this wire. Note the resist...

Solved • Jul 17, 2020

Resistors and Ohm's Law

Q. What happens to the resistance of most common metals as the temperature of the metal increases?Select one:a. The resistance increases as temperatur...

Solved • Jul 17, 2020

Resistors and Ohm's Law

Q. An ammeter is connected in series to a battery of voltage Vb and a resistor of unknown resistance Ru (Figure 1) . The ammeter reads a current Io. N...

Solved • Jul 17, 2020

Resistors and Ohm's Law

Q. In the figure R1 = 2.75R, the ammeter resistance is zero, and the battery is ideal. What multiple of ε/R gives the current in the ammeter?

Solved • Jul 16, 2020

Resistors and Ohm's Law

Q. The figure is a current-versus-potential-difference graph for a cylinder. What is the cylinder's resistance?

Solved • Jun 2, 2020

Resistors and Ohm's Law

Q. The wires in (Figure 1) all have the same resistance; the length and radius of each wire are noted. Rank in order, from largest to smallest, the re...

Solved • Jun 2, 2020

Resistors and Ohm's Law

Q. For this diagram, include three extra circuit symbols:A. An ammeter measuring the current at point AB. A voltmeter measuring the voltage drop acros...

Solved • May 26, 2020

Resistors and Ohm's Law

Q. In household wiring, copper wire 2.05 mm in diameter (12 gauge) is often used. Find the resistance of a 24.0 m length of this wire. Note the resist...

Solved • May 21, 2020

Resistors and Ohm's Law

Q. Imagine a single-loop circuit with a battery, and three resistors R1, R2, R3 connected in series. Resistance is ignorable except for the resistors....

Solved • May 13, 2020

Resistors and Ohm's Law

Q. What is the equivalent resistance between points a and b in the figure?

Solved • May 13, 2020

Resistors and Ohm's Law

Q. Suppose that ℰ = 65 V. (Figure 1)What is the potential difference across the 40 Ω resistor? Express your answer with the appropriate units.What is ...

Solved • Apr 30, 2020

Resistors and Ohm's Law

Q. What is the purpose of the rheostat in the resistance and resistivity experiment?1) to limit the current in the circuit.2) to overheat.3) as an aid...

Solved • Apr 29, 2020

Resistors and Ohm's Law

Q. The diameter of a specific copper wire is 8.325 mm, and has a resistivity of 1.72 x 10-8Ω-m. Find the resistance of a 0.85 km length of such wire u...

Solved • Apr 28, 2020

Resistors and Ohm's Law

Q. a) Explain the distinction between an ohmic and non-ohmic material, in terms of how the current and resistance behave as the voltage difference acr...

Solved • Apr 28, 2020

Resistors and Ohm's Law

Q. You have a circuit consisting of four 4.5 V D-cell batteries in series, some wires, and a light bulb. The bulb is lit and the current flowing throu...

Solved • Apr 27, 2020

Resistors and Ohm's Law

Q. The figure is a current-versus-potential-difference graph for a cylinder.What is the cylinder's resistance?

Solved • Apr 22, 2020

Resistors and Ohm's Law

Q. Pure silicon contains approximately 1.0 x 1016 free electrons per cubic meter.Resistivities at Room Temperature (20 °C)(a) Referring to the table a...

Solved • Apr 14, 2020

Resistors and Ohm's Law

Q. Two identical lightbulbs are connected in series to a single 9.0 V battery.a. Sketch the circuit.b. Sketch a graph showing the potential as a funct...

Solved • Apr 9, 2020

Resistors and Ohm's Law

Q. A 0.0075 v/m electric field creates a 3.9 mA current in a 1.0 mm diameter wire. What material is the wire made of?

Solved • Apr 8, 2020

Resistors and Ohm's Law

Q. A. Consider a circuit containing five identical light bulbs and an ideal battery. Assume that the resistance of each light bulb remains constant. R...

Solved • Apr 8, 2020

Resistors and Ohm's Law

Q. A wire of length L and cross-sectional area A has resistance R.What will be the resistance Rstretched of the wire if it is stretched to twice its o...

Solved • Apr 8, 2020

Resistors and Ohm's Law

Q. Which of the following will increase the resistance of a wire?Check all that apply.a) Decreasing the resistivity of the material the wire is compos...

Solved • Apr 8, 2020

Resistors and Ohm's Law

Q. Consider the circuit shown. (Intro 1 figure) All wires are considered ideal; that is, they have zero resistance. We will assume for now that all ot...

Solved • Apr 7, 2020

Resistors and Ohm's Law

Q. Electrons moving through the circuit in the attached figure will go through the resistorA. go from a to b.B. go from b to a.

Solved • Mar 24, 2020

Resistors and Ohm's Law

Q. What is the equivalent resistance between points a and b in the figure (Figure 1)? Express your answer using one significant figure.

Solved • Mar 11, 2020

Resistors and Ohm's Law

Q. According to Table 1, which of the following materials is the best electrical conductor? Brass Copper Aluminum Nichrome

Solved • Mar 11, 2020

Resistors and Ohm's Law

Q. Rank in order, from largest to smallest, the resistivities ρ1 to ρ5 of these wires. Rank from largest to smallest. To rank items as equivalent, ove...

Solved • Mar 11, 2020

Resistors and Ohm's Law

Q. Which of the following materials is the poorest electrical conductor?A. NichromeB. CopperC. Aluminum D. Brass 

Solved • Mar 11, 2020

Resistors and Ohm's Law

Q. Consider two conductors 1 and 2 made of the same ohmic material (ρ 1 = ρ2). Denote the length of the conductor by ℓ and the radius by r. The same v...

Solved • Jun 27, 2017

Resistors and Ohm's Law

Q. A long, uniform conducting wire with resistance R is connected to the terminals of a battery with emf V, dissipating a power P. If the cross-sectio...

Solved • Apr 28, 2017

Resistors and Ohm's Law

Q. What is the resistance of a Nichrome wire at 0.0°C if its resistance is 100.00 Ω at 45°C? The temperature coefficient for nichrome is 4.00x10-4 (°C...

Solved • Apr 18, 2017

Resistors and Ohm's Law

Q. Two pieces of metal are shaped into resistors and are connected end-to-end. The first resistor, R1, has twice the length of the second resistor, R ...

Solved • Mar 1, 2017

Resistors and Ohm's Law

Q. The resistivity of a 1.0 m long wire is 1.72 x 10 -8 Ωm and its cross-sectional area is 2.0 x 10-6 m2. If the wire carries a current of 0.2 A, what...

Solved • Feb 21, 2017

Resistors and Ohm's Law

Q. The headlight of a car has a resistance R = 3.4Ω. The headlight consists of a tungsten wire (resistivity p = 5.6 x 10-8 Ω • m) of length 12.4 cm. W...

Solved • Jan 13, 2017

Resistors and Ohm's Law

Q. If a cylindrical metal wire is stretched to 4 times of its original length, what is the resulting resistance R, compared with the original resistan...

Solved • Jan 9, 2017

Resistors and Ohm's Law

Q. You are given a copper bar of dimensions 3 cm x 5 cm x 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the...

Solved • Jan 4, 2017

Resistors and Ohm's Law

Q. The current in a resistor decreases by 2.27 A when the voltage applied across the resistor decreases from 12.3 V to 4.26 V. Find the resistance of ...

Solved • Jan 3, 2017

Resistors and Ohm's Law

Q. The length of a certain wire is doubled and at the same time its radius is increased by a factor of 4. What is the change in the resistance of this...

Solved • Dec 22, 2016