Questions – Answers
Electrical and Electronics Engineering Interview Questions and Answers
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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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Difference Between 50 Hz and 60 Hz Frequency System
50Hz vs 60Hz Frequency – Which is Better and Why? The electricity that we use in our homes is produced and supplied by huge generators inside the power generation stations.…
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Difference Between Socket, Outlet and Receptacle
What is the Main Difference Between Outlet, Socket and Receptacle? The terms “socket” and “outlet” are often used interchangeably, but they have different meanings in electrical terminology. In electrical trade…
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Why Do Prongs in Electrical Plugs Have Holes in Them?
Why Do Electric Plugs Have Holes in the Prongs? As you may have already noticed the two little holes near each prong’s tip in an electric plug. If not, there…
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