What is the power rating of a heating with a resistance of 15 Ohm that draws a c

Question

What is the power rating of a heating with a resistance of 15 Ohm that draws a current of 19 A? W A coffeemaker has a resistance of 10 Ohm and draws a current of 5 A. What power does it use? W What is s the resistance of a 65 W lightbulb in a 120 volt circuit? Ohm If a hair dryer is rated at 1200 W, how much energy is used to operate hair dryer for 22 min? Wh If a 70 W bulb is left on continuously in a secluded hallway, how much energy is used each month (30 days)? kWh If electricity costs 9 /kWh, how much does it cost to burn a 95 W bulb for one day? A VCR has a maximum power rating of 21 W when plugged into a 120 volt outlet. What is the maximum current that it requires? A What is the resistance of the coil in a 1800 W heater? (Assume that the heater is connected to a 100 V source.) Ohm A 1300 W heater for a sauna requires 40 min to heat the sauna to 190 degree F. What does this cost if electricity sells for 8/kWh?

Explanation / Answer

12 )

R = 10 Ohm

i = 5 A

P = i2 R

P = 52 X 10

P = 250 W

13 )

P = 65 W ,

V = 120 volts

R = V2 / P

R = 1202 / 65

R = 221.53 Ohm

14 )

t = 22 min = 22 / 60 = 0.3666 hr

P = 1200 W

E = P X t

E = 1200 X 0.3666

E = 439.92 W h

15 )

P = 70 W

t = 30 days

t = 30 X 24

t = 720 sec

E = P X t

E = 70 X 720

E = 50.4 k W h

17 )

i = P / V

i = 21 / 120

i = 0.175 A

18 )

P = 1800 W

V = 100 volts

R = V2 / P

R = 1002 / 1800

R = 5.55 Ohm

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