Notes on Current, Electrical Power, and Power Supplies

Charge

Charge from an Amber Rod.

Charge Units

Atoms are normally neutral

Coulomb’s Law

Current

Voltage

Conductors

Insulators

Semiconductor

Resistance

Resistors

Electrical Circuit

Ohm’s Law

Sample I = V/R Problems

Magnetic Force

Currents create magnetic fields.

Magnetic Field from A Current

Superconductivity

AC vs DC, Alternating vs Direct Current

Ground

Voltages

Frequency of Voltage

Power

Calculating Power

Power Supplies

Voltage Furnished from Power Supplies

Power = Heat

Voltage and Power

Removing Heat

Lightning and Other Surges

Solving Power Problems

Power Surges

Loss of Power

Using UPS’s

Heat Problems in Wiring.

Do Not Overload Wires or Circuits

Other Electrical Problems

Possible Problems

Measuring Voltage, Current & Power

Meters

Multimeters

Navigation Back To Web