Questions – Answers
Electrical and Electronics Engineering Interview Questions and Answers
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Why are Overhead Power Transmission Lines Not Insulated?
Why Use Bare Conductors for Overhead Transmission Lines Instead of Insulated Conductors? You may have noticed that we use insulated cables for underground power transmission, as well as in industrial…
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Why are “High Voltage” Signs used when Only Current Kills?
Why are ‘High Voltage’ Warning Signs Used When It’s Only Current that can Cause Electrocution? “High Voltage” warning signs are used to alert people to the presence of potentially dangerous…
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What Do the 5P10 and 5P20 Mean in a Current Transformer?
What Do the 5P20 and 5P10 Accuracy Classes Mean in Current Transformers? For a current transformer (CT), different accuracy classes, such as 5P10, 5P20, or 10P10, are chosen based on…
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Why is the Grounding Wire Bare and Not Insulated?
Why is Mostly Solid Bare Conductor Used for Grounding Instead of Insulated Wire? A ground wire, also known as a grounding wire or ground conductor (GEC and EGC), as the…
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Why are there Small Red Lights Around the CCTV Cameras?
What is the Purpose of the Red LEDs around a CCTV Security Camera? The small red lights around CCTV (Closed Circuit Television) cameras are typically infrared (IR) LEDs (Light Emitting…
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What is the Right Wire Size for a 4.8kW, 240V Range: #10 or #12?
How to Determine the Correct AWG Wire Size for a 4.8kW, 240V 1-Phase Electric Range According to NEC? Since we’ve already covered various aspects of wire and cable sizing for…
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How Many Amps Will Flow in a Short Circuit Powered by a 120V, 20A Breaker?
In the Case of a Short Circuit Occurring in a 120V Circuit Powered by a 20-Amp Breaker, How Many Amps will Flow Before the Breaker Trips? There is no “one-size-fits-all”…
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What is Watt & kW (Watt & Kilowatt)? – Definition, Formula and Calculation
What is Kilowatt (kW) and Watt (W)? – Definition, Formula, Example and Calculation What is Watt? The watt is a standard unit of power that quantifies the rate at which…
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What is kWh (Kilowatt hour)? – Definition, Formula and Calculation
What is Kilowatt hour (kWh)? – Definition, Formula, Example and Calculation Kilowatt-hour (kWh) is a unit of energy commonly used to measure electricity consumption. It is defined as the energy…
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What is Ohm (Ω)? Unit of Electrical Resistance and Impedance
Ohm “Ω”: Definition, Formula, Measurement, Conversion and Calculation What is Ohm Ω? Ohm is a unit of electrical resistance, named after Georg Simon Ohm, a German physicist who discovered Ohm’s…
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