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Electrical Engineering
Explore questions in the Electrical Engineering category that you can ask Spark.E!
- _________loss is caused by the continuous aligning and realigning of molecules, which produces heat due to friction.
- When using Table 310.15(B)(16), if the ambient temperature is above _______degrees Celsius, a correction factor must be applied to allowable ampacities for conductors.
- If the symbol shows the movable contact touching but below the stationary contact, this indicates that the switch is ______.
- What effect if any does tripping the overload relay have on the circuit when a source current is applied to the circuit ?
- A magnetic contactor or relay is basically an electrical __________ that closes a set of contacts when the coil is energized.
- _______switches are indicated by drawing a wedge shape below the movable contact of a switch symbol.
- What is the maximum operating temperature (in degrees Celsius) for Type SIS insulation?
- The conductors of a single phase are not permitted to be run in metallic conduit because _________ currents will be induced
- All overload relays contain two separate sections, the ______ section and the control contact section.
- If you have a raceway with 35 current-carrying conductors, by what adjustment factor must you multiply the ampacity?
- In a basic air-conditioning circuit there are two _____ switches in order to protect the compressor from extremes.
- Bimetal strip-type overload relays generally permit the trip current to be adjusted to between 85% and _______% of the heater rating.
- The formula for calculating resistance of a certain length, size, and type of wire is: R = _________.
- Materials that increase their resistance with an increase of temperature have a _________ coefficient of temperature
- The speed of the rotating magnetic field of a polyphase ac motor is called ________ speed.
- If you need a large current, should you use a large or small internal resistance?
- What does very high internal resistance act as?
- The ___________ the resistance across a component, the ___________ the current that flows (for a given potential difference across the component)
- When a current flows past a point in a circuit for a length of time, what is the formula for the charge that has passed?
- In a single circuit loop, what has the same value everywhere?