0. Math Review

1. Intro to Physics Units

2. 1D Motion / Kinematics

3. Vectors

4. 2D Kinematics

5. Projectile Motion

6. Intro to Forces (Dynamics)

7. Friction, Inclines, Systems

8. Centripetal Forces & Gravitation

9. Work & Energy

10. Conservation of Energy

11. Momentum & Impulse

12. Rotational Kinematics

13. Rotational Inertia & Energy

14. Torque & Rotational Dynamics

15. Rotational Equilibrium

16. Angular Momentum

17. Periodic Motion

18. Waves & Sound

19. Fluid Mechanics

20. Heat and Temperature

21. Kinetic Theory of Ideal Gases

22. The First Law of Thermodynamics

23. The Second Law of Thermodynamics

24. Electric Force & Field; Gauss' Law

25. Electric Potential

26. Capacitors & Dielectrics

27. Resistors & DC Circuits

28. Magnetic Fields and Forces

29. Sources of Magnetic Field

30. Induction and Inductance

31. Alternating Current

32. Electromagnetic Waves

33. Geometric Optics

34. Wave Optics

36. Special Relativity

[BOOK PHYS] !CLUTCH

Current Through Unknown Resistor

Anderson Video - Resistance Example

A copper transmission cable 100 km long and 10.0 cm in diameter carries a current of 125 A. (b) How much electrical energy is dissipated as thermal energy every hour?

More charge flows through lightbulb 1 than through lightbulb 2.

Less charge flows through lightbulb 1 than through lightbulb 2.

This depends on how charged the capacitor is.

The same amount of charge moves through lightbulb 1 and lightbulb 2.

A wire runs from the positive plate of a capacitor, into lightbulb 1, then out from lightbulb 1 directly into lightbulb 2. When lightbulb 2 is connected to the negative plate of the capacitor, what is true about the charge moving through the two lightbulbs?

A hollow aluminum cylinder is 2.50 m long and has an inner radius of 2.75 cm and an outer radius of 4.60 cm. Treat each surface (inner, outer, and the two end faces) as an equipotential surface. At room temperature, what will an ohmmeter read if it is connected between (a) the opposite faces and (b) the inner and outer surfaces?

A ductile metal wire has resistance R. What will be the resistance of this wire in terms of R if it is stretched to three times its original length, assuming that the density and resistivity of the material do not change when the wire is stretched? (Hint: The amount of metal does not change, so stretching out the wire will affect its cross-sectional area.)

The potential drops across the resistor in the direction that electrons move.

There is no change in potential across the resistor.

The potential might increase or decrease across the resistor in the direction that electrons move.

The potential increases across the resistor in the direction that electrons move.

Which of the following is true about the change in potential across a resistor in a circuit?

The circuit shown in Fig. E25.30<img src="https://lightcat-files.s3.amazonaws.com/problem_images/8df74f614a3cdb81-1674062071886.jpg" alt="" /> contains two batteries, each with an emf and an internal resistance, and two resistors. Find (c) the potential difference Vac of point a with respect to point c.

In household wiring, copper wire 2.05 mm in diameter is often used. Find the resistance of a 24.0-m length of this wire.

Resistance & Resistivity, An Explanation

Two resistors are made of the same material, one twice as long as the other. If the current through the shorter resistor is 5 A, what is the current through the longer resistor if they both have the same potential difference?

Ohm's Law, Example Problems

Resistance and Ohm's Law

Anderson Video - Resistance and Resistivity

A cylindrical tungsten filament 15.0 cm long with a diameter of 1.00 mm is to be used in a machine for which the temperature will range from room temperature (20°C) up to 120°C. It will carry a current of 12.5 A at all temperatures. (c) What will be the maximum potential drop over the full length of the filament?

A resistor has a current through it of 5 A. If the EMF across the resistor is 10 V, what is the resistance of this resistor?

Resistivity & Resistors in Circuits

Ohm's law - derivation (using drift velocity)| Electricity | Physics | Khan Academy

A certain wire has length L and radius r, and a resistance of R. That wire is melted down and the same volume of the same metal is used to produce a wire with length 2L. What is the resistance of the resulting wire?

Anderson Video - Measuring Current and Voltage

Resistors and Ohm's Law

Ohm's Law

Anderson Video - Ohm's Law

A copper wire with a radius of <math display='inline'><mrow><mn>2</mn><mo>.</mo><mrow><mn>0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">&#x00A0;mm</mi></mrow></mrow></math> and a length of <math display='inline'><mrow><mn>0</mn><mo>.</mo><mrow><mn>80</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">&#x00A0;m</mi></mrow></mrow></math> is connected across the terminals of a <math display='inline'><mrow><mn>9</mn><mo>.</mo><mn>0</mn><mtext>&#x00A0;</mtext><mi mathvariant="normal">V</mi></mrow></math> battery. How much current flows in the wire?

A copper wire and an aluminum wire have the same diameter. If the copper wire is <math display='inline'><mrow><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">&#x00A0;m</mi></mrow></mrow></math> long, how long is the aluminum wire if they have the same resistance?

(b) What is the resistance of a carbon rod at 25.8°C if its resistance is 0.0160 Ω at 0.0°C?

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