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Questions and Answers
What is the primary difference between direct current (DC) and alternating current (AC)?
What is the primary difference between direct current (DC) and alternating current (AC)?
- DC flows in one direction, while AC alternates its direction (correct)
- DC is produced by batteries, while AC is generated by power plants
- DC has a constant voltage, while AC has a varying voltage
- DC is used for low-power applications, while AC is used for high-power applications
Which statement about the waveform of DC is true?
Which statement about the waveform of DC is true?
- It has a constant amplitude over time (correct)
- It has a sinusoidal shape
- It alternates between positive and negative values
- It has a square wave shape
What is the standard AC voltage and frequency used in North America?
What is the standard AC voltage and frequency used in North America?
- 120 V and 50 Hz
- 220 V and 60 Hz
- 220 V and 50 Hz
- 120 V and 60 Hz (correct)
What is the primary reason for using AC for high-power applications?
What is the primary reason for using AC for high-power applications?
What is the unit of power?
What is the unit of power?
What is the relationship between watts and joules?
What is the relationship between watts and joules?
What is the unit of electric power?
What is the unit of electric power?
One horsepower is equivalent to how many watts?
One horsepower is equivalent to how many watts?
What is the formula for calculating electric power using current and voltage?
What is the formula for calculating electric power using current and voltage?
If a light bulb is plugged into a 120-volt outlet and has a current of 0.7 amperes, what is its power rating?
If a light bulb is plugged into a 120-volt outlet and has a current of 0.7 amperes, what is its power rating?
If a heater uses 21 amperes when connected to a 110-volt line, and electric power costs 10 cents per kilowatt-hour, what is the cost of running the heater for 13 hours?
If a heater uses 21 amperes when connected to a 110-volt line, and electric power costs 10 cents per kilowatt-hour, what is the cost of running the heater for 13 hours?
What is the unit of energy consumption commonly used for electrical appliances?
What is the unit of energy consumption commonly used for electrical appliances?
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