The building block of all theories of electricity is charge. Charge is a fundamental property of matter, just like mass. Like mass describes the interaction of matter and gravitational fields, char...

Every charged particle interacts with other charged particles via its electric field. An electric field is the invisible force field that charges create, the same way earth creates a gravitational...

If electric fields can create forces and move charges around, they must be able to change charged particles' mechanical energies. This is true—and to that end, in this section we'll meet another...

All this talk about charged particles and equipotential lines is fine, but when it comes to making light bulbs glow and loudspeakers thump and toasters toast, we need more than just fields and char...

Using Ohm's Law, we can solve the world's simplest circuit.What in the name of Karl Friedrich Gauss' ghost, you may be asking, is that? Well, that's a circuit. It'd be a pain to draw batteries and...

No discussion of electromagnetism would be complete without, well, magnetism. Magnetism is the irreplaceable partner to electricity—the Starsky to its Hutch, the Siegfried to its Roy, the Ferb to...

Of course, fields are great and all—but it's a field's ability to do work that makes them interesting. Magneto would be a way less interesting supervillain if magnetic fields couldn't create forc...

Electromagnetic induction is one of the fundamental building blocks of today's world—it's the secret behind everything from generators to sparkplugs to transformers (yes, normal transformers as w...

Real circuits use more than just resistors to manipulate charge. There's a whole armory of circuit elements electrical engineers have at their disposal, and like Q briefing James Bond, we're about...

ChargeThere are two directions at work in Coulomb forces. One is the sign that results from Coulomb's Law—whether the force is attractive or repulsive. But the other is what direction "attraction...

Charge1. What force does a 1 mC charged particle feel when placed 1 m away from a 2 mC charged particle? Is the force attractive or repulsive?2. How much does the force increase if the 2 mC charge...