27. Resistors & DC Circuits

Intro to Current

27. Resistors & DC Circuits

Intro to Current

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Anderson Video - Electric Circuits Intro

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Anderson Video - Electric Circuits Intro

Anderson Video - Electric Current

Anderson Video - Charge in a AA Battery

Anderson Video - Current in Everyday Devices

Anderson Video - DC vs. AC

The Electric Battery and Conventional Current - Introduction to Basic Electricity

The Organic Chemistry Tutor

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02:59

Electric Current, An Explanation

Intro to current (& Amperes)

Khan Academy India - English

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Multiple Choice

A lightning bolt hits the ground carrying a current of 3 × 10⁴ A. If the strike lasts 50 ms, how much charge enters the ground?

Which of the following is always true about capacitors and batteries?

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Multiple Choice

A wire is connected to the positive and negative plates of a capacitor. Electrons in the wire feel an attraction toward the positive plate of a capacitor, and a repulsion from the negative plate. What is true about the motion of these electrons?

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Textbook Question

An aluminum wire consists of the three segments shown in FIGURE P27.64. The current in the top segment is 10 A. For each of these three segments, find the b. Current density J. Place your results in a table for easy viewing.

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Textbook Question

Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s; this lasts for 100 ms or less. How much charge flows between the ground and the cloud in this time? How many electrons flow during this time?

A linear accelerator uses alternating electric fields to accelerate electrons to close to the speed of light. A small number of the electrons collide with a target, but a large majority pass through the target and impact a beam dump at the end of the accelerator. In one experiment the beam dump measured charge accumulating at a rate of −2.0 nC/s. How many electrons traveled down the accelerator during the 2.0 h run?

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Textbook Question

(I) A current of 1.75 A flows in a wire. How many electrons are flowing past any point in the wire per second?

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Textbook Question

(II) What is the current in amperes if 1200 Na⁺ ions flow across a cell membrane in 2.8 μs? The charge on the sodium is the same as on an electron, but positive.

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Textbook Question

For the wire in Fig. 25–38, whose diameter varies uniformly from a to b as shown, suppose a current I = 2.5 A enters at a. If a = 2.5 mm and b = 4.0 mm, what is the current density (assume uniform) at each end? <IMAGE>

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27. Resistors & DC Circuits

Intro to Current

Learn with Patrick

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Practice this topic