Which consumes more energy, a 1.5 kW hair dryer used for 10 min or a 10 W night light left on for 19 hr?
Ah, the battle between the blow-dryer and the night light! Well, let's do a little math while keeping things amusing, shall we?
So, the hair dryer is quite the powerhouse at 1.5 kW, but it's only used for 10 minutes. On the other hand, the innocent little night light is just 10 W but stays on for a whopping 19 hours.
To find out which one consumes more energy, let's convert both to the same unit. We'll go with kilowatt-hours (kWh) since it's easier to compare that way.
The hair dryer, being 1.5 kW, is on for 10 minutes, which is 10/60 hours, so it consumes 1.5 x (10/60) = 0.25 kWh. Not bad for a quick hair freshen-up!
Now, the night light being 10 W and staying on for 19 hours consumes 10 x 19 = 190 Wh, which is 0.19 kWh.
Voila! The hair dryer takes the crown in this energy consumption showdown, using up 0.25 kWh compared to the night light's 0.19 kWh.
But hey, let's not forget that those numbers are just for fun! In reality, it's always best to be conscious of energy usage and try to save wherever we can. So, don't leave that night light on for too long or use the hair dryer for more than necessary!
To determine which consumes more energy, we can compare the energy used by both the hair dryer and the night light.
First, let's calculate the energy used by the hair dryer:
Power (in kilowatts) = 1.5 kW
Time (in hours) = 10 minutes ÷ 60 = 0.167 hours
Energy (in kilowatt-hours) = Power × Time
Energy (in kilowatt-hours) = 1.5 kW × 0.167 hours
Energy (in kilowatt-hours) = 0.2505 kWh
Next, let's calculate the energy used by the night light:
Power (in kilowatts) = 10 W ÷ 1000 = 0.01 kW
Time (in hours) = 19 hours
Energy (in kilowatt-hours) = Power × Time
Energy (in kilowatt-hours) = 0.01 kW × 19 hours
Energy (in kilowatt-hours) = 0.19 kWh
Comparing the two values, we can see that the hair dryer consumes 0.2505 kilowatt-hours of energy, while the night light consumes 0.19 kilowatt-hours of energy. Therefore, the hair dryer consumes more energy than the night light.
To determine which consumes more energy, we need to calculate the energy used by each device. Energy is measured in kilowatt-hours (kWh), which represents the amount of energy consumed over time.
For the hair dryer:
Power (P) = 1.5 kW
Time (t) = 10 min
To convert the time to hours, divide 10 min by 60 (since there are 60 minutes in an hour):
t = 10 min / 60 = 0.167 hr
Energy used (E) = P x t = 1.5 kW x 0.167 hr = 0.25 kWh
For the night light:
Power (P) = 10 W
Time (t) = 19 hr
Energy used (E) = P x t = 10 W x 19 hr = 190 Wh
To convert watt-hours (Wh) to kilowatt-hours (kWh), divide by 1000:
E = 190 Wh / 1000 = 0.19 kWh
Comparing the two, we find that the hair dryer consumes 0.25 kWh of energy, while the night light consumes 0.19 kWh. Therefore, the hair dryer consumes more energy in this scenario.
energy=power*timeinseconds
a) dryer power=1500*600
b) night light=10*19(3600)
do the math.