| Alternating Current
| Voltage forces electrons to flow in one direction and then quickly alternates to the opposite direction. |
| Ammeter
| A device to measure amperes (current). |
| Ampere
| (Amps, Amperage) A unit of electrical current. |
| Coulomb
| A standard unit of electric charge in the international system of units (SI). One coulomb is the amount of electric charge carried by a current of one ampere flowing for one second. |
| Conductor
| A material that permits a very free exchange/movement of electrons from one atom to another. |
| Conventional Flow
| This theory states that electrons flow from positive (+) to negative (-). |
| Current
| The flow of electrons in the same direction from atom to atom. |
| Direct Current
| Voltage forces the electrons to flow continuously in one direction. |
| Electromagnets
| Do not retain their magnetism after a magnetizing force is removed. |
| Electromagnetic Induction
| The creation of voltage in a conductor from movement of the conductor or the magnetic field. |
| Electron Flow
| This theory states that electrons flow from negative (-) to positive (+). |
| Frequency
| The number of cycles in one second of alternating current. Expressed in hertz (Hz). For example, 60 Hz is 60 cycles in one second. |
| Insulators
| Materials that don’t readily give up electrons, thereby restricting the flow of current. |
| Ohm
| Unit of resistance. |
| Ohm’s Law
| Current is directly proportional to voltage and inversely proportional to resistance. |
| Parallel Circuits
| Loads are connected across the power line to form branches. |
| Permanent Magnets
| Retain their magnetism after a magnetizing force is removed. |
| Resistance
| The restriction to the flow of electrons. |
| Right-Hand Rule
| A current carrying conductor held in right hand will indicate the direction of lines of flux. |
| RMS Value
| (Root Mean Square) Current is also referred to as effective current and is the square root of the average of all the instantaneous currents (current at any point on a sine wave) squared. |
| Series Circuit
| All loads in the circuit are connected one after the other. |
| Single-Phase
| A continuous single alternating current cycle. |
| Three-Phase
| A continuous series of three overlapping AC cycles offset by 120 degrees. |
| Transformer
| A device used to raise (step up) or lower (step down) a voltage level. |
| Volt
| Unit of force applied to a conductor to free electrons, to cause electrical current flow. |
| Voltage
| A device used to measure voltage by finding the potential voltage between two points. |
| Voltage Drop
| Voltage value as measured across each resistor or load. |
| Voltmeter
| A device to measure voltage. |
| Watt
| The basic unit of power, indicating the amount of work accomplished when one volt causes one ampere to pass through a circuit. |
