Alternating currents - Study guides, Class notes & Summaries

Active Shielding ~~> The use of a coil of wire, with an electrical current running through it, to produce an electromagnetic field opposing the static magnetic field, to reduce the fringe field. Bsub0 ~~> The unit used to describe the static magnetic field. Deflection ~~> The amount of attraction an object has to the static magnetic field. Diamagnetism ~~> A weakly repulsive force when placed in a strong static magnetic field. Faradays Law of Induction 2 | P a g ...

AP Environmental Science Exam Review Questions with solutions 2024 abiotic Pertaining to factors or things that are nonliving. acid Any compound that releases hydrogen ions when dissolved in water. Also, a water solution that contains a surplus of hydrogen ions. A horizon a soil horizon; the layer below the O layer is called the A layer. The A layer is formed of weathered rock, with some organic material; often referred to as topsoil. alkaline a basic substance; chemica...

The ordinary direct current series motor does not operate satisfactorily with alternating current. One of the main reasons for this is a. excessive heating due to eddy currents in the solid parts of the field structure b. that the armature current and field current are out of phase with each other c. that the field flux lags 120 in time phase with respect to the line voltage d. excessive heating due to the low voltage drop in the series field correct answer: a. excessive heating due to e...

Welding - Chapters 1-6 - First Exam, With Complete Verified Solution List welding Currents: AC,DC-,DC+ What is the Definition of welding current the current in the welding circuit during the making of the weld. Three units are used to measure welding current Voltage: electrical pressure Amperage: number of electrons flowing Wattage: power of the arc What approximately is The temperature of the arc? 11,000°F (6000°C). Three different types of current used for welding are Alternati...

Stationary Engineer Electric Graded A An AC circuit consists only of a pure inductance and a power source. The relationship between the voltage and the current in this circuit is that the ️current lags the voltage The power factor of a load is equal to the ____________ power divided by the ____________ power. ️True ; apparent A 10-ohms and 20-ohms resistor are connected in parallel. The total line current drawn by this parallel combination is 30 amps. Under these conditions, the ...

Stationary Engineer Electric Exam Questions and Answers 100% Pass An AC circuit consists only of a pure inductance and a power source. The relationship between the voltage and the current in this circuit is that the - Correct Answer ️️ - current lags the voltage The power factor of a load is equal to the ____________ power divided by the ____________ power. - Correct Answer ️️ -True ; apparent A 10-ohms and 20-ohms resistor are connected in parallel. The total line current drawn ...

Eddy currents are circulating electrical currents induced in conductive materials by: - Answer-an alternating magnetic field The method used to generate eddy currents in a test specimen by means of a coil can most closely be compared with the action of a: - Answer-transformer Electromagnetic testing relies on the principle of: - Answer-electromagnetic induction When the electrical current in an eddy current coil reverses direction, the: - Answer-direction of the eddy currents in the test p...

Slew rate ~~> Speed at which gradient coil turns on and off Time-varying Gradient ~~> Induced current in a patient Magnetic Flux Lines ~~> Travel from North to South pole permanent magnet ~~> Can not be turned off Very inexpensive; extremely heavy Approximately 0.4T Vertical vector Resistive magnet ~~> Can be turned on and off Costly due to cooling 2 | P a g e | © copyright 2024/2025 | Grade A+ Master01 | September, 2024/2025 | Latest update Approximately 0....

The ordinary direct current series motor does not operate satisfactorily with alternating current. One of the main reasons for this is a. excessive heating due to eddy currents in the solid parts of the field structure b. that the armature current and field current are out of phase with each other c. that the field flux lags 120 in time phase with respect to the line voltage d. excessive heating due to the low voltage drop in the series field - correct answer a. excessive heating due to e...

Journeyman #6 Exam Questions and Answers Something that would affect the ampacity of a conductor would be __________. I. Voltage II. Amperage III. Length IV. Temperature a. I only b. II only c. III only d. IV only - Answer-D Alternating currents may be increased or decreased by means of a __________. a. Motor b. Transformer c. Dynamo d. Megger - Answer-B Fixtures supported by the framing members of suspended ceiling systems shall be securely fastened to the ceiling framing member...