27. Resistors & DC Circuits

Resistors and Ohm's Law

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

Current Through Unknown Resistor

Anderson Video - Resistance Example


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?



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?


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 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

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

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?

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