1.
How many kilowatts are in 5000 watts?
Correct Answer
B. 5 kW
Explanation
To convert watts to kilowatts, divide by 1000.
Calculation: 5000 W / 1000 = 5 kW.
Therefore, 5000 watts is equal to 5 kilowatts.
2.
How many kilowatts does a 2500-watt heater use in 2 hours?
Correct Answer
A. 5 kWh
Explanation
First, convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 2500 W = 2.5 kW.
Calculation: Energy = Power x Time = 2.5 kW x 2 hours = 5 kWh.
The heater uses 5 kilowatt-hours of energy in 2 hours.
3.
How many kilowatts are needed to power ten 100-watt light bulbs?
Correct Answer
D. 1 kW
Explanation
First, calculate the total power consumption in watts, then convert to kilowatts.
Calculation: Total Power = 10 x 100 W = 1000 W.
Conversion: 1000 W / 1000 = 1 kW.
Therefore, ten 100-watt light bulbs use 1 kilowatt of power.
4.
How many kilowatts are consumed by an appliance using 200 watts continuously for 5 hours?
Correct Answer
A. 1 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 200 W = 0.2 kW.
Calculation: Energy = Power x Time = 0.2 kW x 5 hours = 1 kWh.
The appliance uses 1 kilowatt-hour of energy over 5 hours.
5.
How many kilowatts does a 1500-watt air conditioner use in 8 hours?
Correct Answer
D. 12 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 1500 W = 1.5 kW.
Calculation: Energy = Power x Time = 1.5 kW x 8 hours = 12 kWh.
The air conditioner uses 12 kilowatt-hours of energy over 8 hours.
6.
How many kilowatts does a 60-watt light bulb use in 24 hours?
Correct Answer
A. 1.44 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 60 W = 0.06 kW.
Calculation: Energy = Power x Time = 0.06 kW x 24 hours = 1.44 kWh.
The light bulb uses 1.44 kilowatt-hours of energy over 24 hours.
7.
How many kilowatts are in 1 megawatt?
Correct Answer
C. 1000 kW
Explanation
We know,MW = 1,000,000 W.
We know that 1 kW = 1000 W.
To find out how many kilowatts are in a megawatt, we divide the number of watts in a megawatt by the number of watts in a kilowatt:
Calculation: 1,000,000 W / 1000 W/kW = 1000 kW.
8.
How many kilowatts are needed to power a 250-watt computer for 10 hours?
Correct Answer
B. 2.5 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 250 W = 0.25 kW.
Calculation: Energy = Power x Time = 0.25 kW x 10 hours = 2.5 kWh.
The computer uses 2.5 kilowatt-hours of energy over 10 hours.
9.
How many kilowatts are produced by a 5000-watt generator?
Correct Answer
B. 5 kW
Explanation
Convert the power from watts to kilowatts by dividing by 1000.
Calculation: 5000 W / 1000 = 5 kW.
Therefore, the generator produces 5 kilowatts of power.
10.
How many kilowatts does a 100-watt solar panel generate in 10 hours of sunlight?
Correct Answer
C. 1 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 100 W = 0.1 kW.
Calculation: Energy = Power x Time = 0.1 kW x 10 hours = 1 kWh.
The solar panel generates 1 kilowatt-hour of energy over 10 hours of sunlight.
11.
How many kilowatts are consumed by a 300-watt device running for 3 hours?
Correct Answer
A. 0.9 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 300 W = 0.3 kW.
Calculation: Energy = Power x Time = 0.3 kW x 3 hours = 0.9 kWh.
The device uses 0.9 kilowatt-hours of energy over 3 hours.
12.
How many kilowatts are in 4500 watts?
Correct Answer
B. 4.5 kW
Explanation
Convert the power from watts to kilowatts by dividing by 1000.
Calculation: 4500 W / 1000 = 4.5 kW.
Therefore, 4500 watts is equal to 4.5 kilowatts.
13.
How many kilowatts does a 750-watt microwave use in 1 hour?
Correct Answer
A. 0.75 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 750 W = 0.75 kW.
Calculation: Energy = Power x Time = 0.75 kW x 1 hour = 0.75 kWh.
The microwave uses 0.75 kilowatt-hours of energy in 1 hour.
14.
How many kilowatts are consumed by a 1000-watt oven used for 2.5 hours?
Correct Answer
A. 2.5 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 1000 W = 1 kW.
Calculation: Energy = Power x Time = 1 kW x 2.5 hours = 2.5 kWh.
The oven uses 2.5 kilowatt-hours of energy over 2.5 hours.
15.
How many kilowatts are required to run a 1200-watt motor for 4 hours?
Correct Answer
B. 4.8 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 1200 W = 1.2 kW.
Calculation: Energy = Power x Time = 1.2 kW x 4 hours = 4.8 kWh.
The motor uses 4.8 kilowatt-hours of energy over 4 hours.
16.
How many kilowatts does a 400-watt pump use if it runs for 6 hours?
Correct Answer
A. 2.4 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 400 W = 0.4 kW.
Calculation: Energy = Power x Time = 0.4 kW x 6 hours = 2.4 kWh.
The pump uses 2.4 kilowatt-hours of energy over 6 hours.
17.
How many kilowatts are needed to operate a 2 kW machine for 3 hours?
Correct Answer
A. 6 kWh
Explanation
Multiply the power in kilowatts by the time in hours.
Calculation: Energy = Power x Time = 2 kW x 3 hours = 6 kWh.
The machine uses 6 kilowatt-hours of energy over 3 hours.
18.
How many kilowatts does a 150-watt fan use if it runs for 20 hours?
Correct Answer
B. 3 kWh
Explanation
Convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 150 W = 0.15 kW.
Calculation: Energy = Power x Time = 0.15 kW x 20 hours = 3 kWh.
The fan uses 3 kilowatt-hours of energy over 20 hours.
19.
How many kilowatts are in 9000 watts?
Correct Answer
A. 9 kW
Explanation
To convert watts to kilowatts, you divide by 1000 because 1 kilowatt is equal to 1000 watts.
Calculation: 9000 W/1000=9 kW
9000 W=9 kW
Therefore, 9000 watts is equal to 9 kilowatts.
20.
How many kilowatts does a 50-watt device use in 10 hours?
Correct Answer
A. 0.5 kWh
Explanation
First, convert the power from watts to kilowatts, then multiply by the time in hours.
Conversion: 50 W=50/1000=0.05 kW
Calculation: Energy = Power x Time = 0.05 kW×10 hours=0.5 kWh
The device uses 0.5 kilowatt-hours of energy over 10 hours.