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Videos By Chapter
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Inquiries Into Physics



 

 

 

 

Chapter 7: Electricity

  1. Electric Charge
  2. Electric Force and Coulomb's Law
  3. Electric Current
  4. Electric Circuits and Ohm's Law
  5. Power and Energy in Electric Currents
  6. AC and DC

 

 

Electricity Videos

Electric Charge

Discussion
Streaming
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Demo Page
Electroscope
As the charged rod is brought close to the knob, opposite charges are attracted by it into the knob. This leaves the post and silver leaf with the same charge. Thus, the repel each other and the leaf moves out.

Real

Real

MPG

Electrostatic Balloon
A charged balloon will stick to a wall.

Real

Real

MPG

Electrostatic Pom Pom
In the presence of a charged rod, a tissue pom pom will puff due to the repulsion of the ends.

Real

Real

MPG

 

Electrostatic Pith Balls
Pith balls can be attracted to the rod or can be made to repel each other.

Real

Real

MPG

 

Wimshurst Machine
Static charge buildup can be seen as sparks between the two knobs.

Real

Real

MPG

Wimshurst Machine; charged bells
Static charge buildup on the bells attracts small metal balls, making them ring.

Real

Real

MPG

Wimshurst Machine; hail storm
Static charge buildup on the bottom plate repels small balls, making them jump.

Real

Real

MPG

Van de Graaff
The Van de Graaff builds up a high static charge so that electric fields and charge transfer effects can easily be observed. Notice that the spark would prefer to jump to a point rather than a ball; hence, lightening rods attract lightening

Real

Real

MPG

Electric Force and Coulomb's Law

Discussion
Streaming
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Demo Page
Electrostatic Ruler
The force between the two charges can be used to turn the ruler.

Real

Real

MPG

Electrostatic Yard Stick
The force between the two charges can be used to turn the yard (or meter) stick.

Real

Real

MPG

Electric Current

Discussion
Streaming
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Demo Page
Conduction in Liquids
A bulb has two probes that make an open circuit when initially plugged into the socket. Placing the bulbs into ordinary tap water does not complete the circuit. However, add a dash of salt, and the ions are free to carry current, closing the circuit and making the light glow. The more salt, the brighter the bulb.

Real

Real

MPG

Electric Circuits and Ohm's Law

Discussion
Streaming
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Demo Page
Fuse Wire
A piece of fuse wire is attached between two posts, completing the circuit. Light bulbs, in parallel, are added to the circuit by screwing them into their sockets. When the current load is too much for the wire, the fuse wire will burn and break, "blowing" the fuse and protecting the circuit.

Real

Real

MPG

Power and Energy in Electric Circuits

Discussion
Streaming
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Demo Page
Short a Capacitor
A large capacitor is charged through a resistor and then is shorted by touching the leads together. It gives a resounding CRACK and bright flash of light due to the quick loss of potential.

Real

Real

MPG

AC and DC

Discussion
Streaming
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Demo Page
AC and DC Generator
This motor can be set up to produce both AC and DC currents.

Real

Real

MPG

E and M
5K40.40

 

 

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