Calculate the energy in joules used by a 47 W appliance that is operated for 5 minutes.

Q: Suppose you use 57 kWh (kilowatt hours) of electricity at $0.35 per kWH, 91 kWh at $0.26 per kWh,…

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Q: If a 3500 Watt oven is on for 4 hours, then how many kilowatt-hours (kWh) of energy are used? kWh…

A: Energy is defined as E=Pt Here E is energy, P is power and t is time.

Q: A hair dryer is rated at 1200 W. One average, it is used for 400 minutes every month. The rate for…

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Q: Calculate the cost of leaving 1300 W refrigerator for a year, if the electric company charges you 12…

A: Write the formula for the total amount of power used in a year. Ptotal=watts×hours used per day×days…

Q: R2 = 576 2 R = 576 2 ww R3 = 576 2 ww

A: Given: R1=576 ΩR2=576 ΩR3=576 Ω The supplied voltage is 120 V.

Q: If a blow dryer uses 1.1 x 10³ J of energy, and it is in use for 15 minutes, what is its power? the…

A: Given, energy consumed E=1.1x103W

Q: Energy c o s t s $ 0.053/kWAh. A toaster, rated at1.0 kWAh, is used for a total of 30 minutes per…

A: The kilowatt-hour (kWh) is the unit of energy equivalent to 1 kilowatt (kW) of power expended for 1…

Q: A dime has mass 2.268 grams. Calculate the number of years the rest energy of a dime could be used…

A: Given data The mass of the dime is given as m = 2.26 grams. The power of the lightbulb P = 75 W.…

Q: A certain factory machine uses 75 BTU/s to operate. If there are 3 identical machines running at the…

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Q: What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock…

A: Given data: Power, P=2.00 W Time taken, t=540 days

Q: A clothes dryer uses 3000 W and is run fro 1 hour. If the total useful energy to dry the clothes is…

A: Given: Power of the dryer P= 3000 W  time to use dryer = 1 hour  Total useful energy to dry the…

Q: A 100-W light bulb is left on for 10.0 hours. Over this period of time, how much energy was used by…

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Q: ne 9-volt battery contains 19.7 thousand joules of energy.  A 4-pack of 9-volt batteries cost $10.31…

A: The energy in one battery E =19.7×103 J Total energy of 4 pack 9V battery is 4E The power is 1 Watt…

Q: Matthew (220lbs) has a Monarch cycle ergometer that he rides every morning.  He expends 300 Kcals…

A: Given, Mass of Matthew, m=220 lbs=99.8 kg Energy spent, E=300 kcals=1.25×106J Time,t=30 minute=1800…

Q: An appliance used up 33.0 kJ of energy for 60 seconds at a 220 V potential difference. 1.  How much…

A: Given data:  Energy (E) = 33.0 kJ = 33.0×103 J Time (t) = 60 s Required: Power (P)

Q: A small wind turbine has 3 blades that are 1m radius each. Take the air density on a typical day to…

A: A turbine is a device that converts fluid rotational energy captured by a rotor system into useful…

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.