Electric Power and Energy Concepts

This video tutorial explains how to calculate the costs of electricity by first determining the electric power consumed by a refrigerator. It covers the difference between electric power and energy, and demonstrates how to calculate electric energy consumption over a month. The tutorial also shows how to compute the cost of electricity based on kilowatt-hour rates. Finally, it encourages viewers to provide feedback and suggest topics for future videos.

What is the first step in calculating the cost of electricity for a device?

• Calculate the total energy consumption

• Find the cost per kilowatt-hour

• Determine the electric power

• Measure the device's temperature

Which of the following is a unit of energy?

• Kilowatt

• Watt

• Ampere

• Joule

How is electric power calculated for a device?

• By dividing voltage by current

• By multiplying voltage and current

• By subtracting current from voltage

• By adding voltage and current

What is the electric power delivered to a refrigerator drawing 2.3 amps from a 120 volt supply?

• 276 Amperes

• 276 Kilowatts

• 276 Joules

• 276 Watts

How do you convert watts to kilowatts?

• Add 1000

• Subtract 1000

• Divide by 1000

• Multiply by 1000

What is the total energy consumption in kilowatt-hours for a device using 276 watts over a month?

• 198.72 kWh

• 24 kWh

• 276 kWh

• 1000 kWh

What is the cost of electricity if the consumption is 198.72 kWh and the rate is 11 cents per kWh?

• $30.00

• $25.00

• $21.86

• $19.87

What information is needed to calculate the electric power if the wattage is unknown?

• Voltage and resistance

• Current and resistance

• Voltage and current

• Power and time

What is the typical voltage for a power outlet in the US?

• 120 volts

• 220 volts

• 240 volts

• 110 volts

What is the formula to calculate energy from power?

• Energy = Power x Time

• Energy = Power + Time

• Energy = Power / Time

• Energy = Power - Time