18 Questions
What is the submultiple unit of power that is 1-thousandth of a watt?
Milliwatt
In the context of electric power, which equation represents the relationship between work and time?
Power = work / time
What is the unit commonly used for large amounts of electrical work or energy?
Kilowatt hour (kWh)
How is electric cost calculated for an air conditioner operating at 220 volts and 15 amperes?
$3300 \text{ watts} \times 15 \text{ amperes}$
What is the formula to calculate power in electric systems?
$P = V \times I$
What is the equivalent of 1 million watts in standard form?
$10^6$ W
What is the resistance of a device that dissipates 1.2 kW of power when its current is 10 A?
120 $ ext{ } m{ ext{Ohm}}$
How much current does a 960 W coffeemaker draw from the 120 V power line?
6 A
What is the resistance of a 20 W, 12 V halogen lamp?
72 $ ext{ } m{ ext{Ohm}}$
In choosing a resistor for a circuit, what is the recommended maximum power dissipation in relation to its power rating?
Never more than 50%
In a circuit where a resistor has a 54 V IR drop and a current of 20 mA, what is the resistance of the resistor?
2.7 $ ext{ } m{ ext{kOhm}}$
If a circuit has a power dissipation of 100 W with a current of 5 A, what is the voltage across the circuit?
20 V
What is the cost of using a 450-W microwave for 2 hours if the electricity rate is ₺0.08/kWh?
₺1.44
A 60-W light bulb is used for 5 hours per day for a month at ₺0.09/kWh. What is the total cost of using this light bulb for the month?
₺4.86
If a device operates at 120 W and runs for 8 hours a day at a cost of ₺0.06/kWh, what is the daily cost of operating this device?
₺6.72
What is the total cost of using a computer that consumes 250 W of power for 4 hours per day at a rate of ₺0.10/kWh for a month?
₺7.20
If a device with a power rating of 90 W runs for 6 hours a day, how much does it cost to operate it for a week at an electricity rate of ₺0.05/kWh?
₺4.32
A refrigerator consumes 400 W of power and runs for 24 hours a day at a rate of ₺0.12/kWh. What is the monthly cost of operating this refrigerator?
₺115.20
Test your knowledge on calculating electrical power, energy consumption, and cost in electrical circuits. Topics include converting watts to kilowatts, multiplying power by hours to get energy, determining the output voltage of a power supply, and calculating the cost of electricity usage.
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