Question 1 of 10
What is the standard voltage in North America for residential applications?
The standard voltage in North America for residential use is 120V.
Question 2 of 10
What voltage is typically available between two hot wires for heavy-load appliances in a residential setting?
240V is used for appliances like dryers, stoves, and electric heaters.
Question 3 of 10
In what decade did the US standard voltage begin to shift towards 120V?
The shift towards 120V as the standard happened in the 1960s.
Question 4 of 10
Why did Thomas Edison initially choose approximately 110V for his DC distribution systems?
Lower voltages were initially chosen to reduce the risk of electrocution and other hazards during the early days of electricity distribution.
Question 5 of 10
What was the main advantage that the AC power system had over the DC power system?
AC power could be transmitted at higher voltages using transformers for long distances which significantly reduced the voltage drop.
Question 6 of 10
What is the voltage range typically indicated on appliances designed to operate with the US residential power system?
Appliances are generally designed to operate within a range around the nominal 120V, but the range is wider.
Question 7 of 10
What does NEMA stand for?
NEMA is an organization which publishes standards for electrical equipment
Question 8 of 10
Why might you find older devices rated for 110V or 115V still operating in homes?
Older devices can work because the voltage had increased over time.
Question 9 of 10
What is the nominal single-phase voltage in many IEC-following countries?
Most IEC-following countries use 230V for single-phase applications.
Question 10 of 10
Which of the following is NOT a voltage level commonly used in the U.S. for residential applications?
400V is not a standard voltage for residential use in the U.S.
1 / 10
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