Lightbulb A was found out to give 30.0W of power, producing the same brightness as lightbulb B operating at 9.50W. The lifetime of A is 9,000 hours and can be bought at Php229.00. B has lifetime of 750 hours and can be bought at Php39.00. Which bulb is more efficient in energy saving? Determine the total amount saved when choosing the efficient bulb over the same period of time. Assume that Meralco charges Php 9.65 per kWh.

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: You place an ice cube in a microwave oven. If it requires 32,195 J to melt the ice cube and the oven…

A: The equation for the power delivered to the microwave oven. P = Q/t the power is directly…

Q: Motor A Initial Investment 1,250,000 1,300,000 Horse Power 100Hp 100Hp Efficiency 74% 92% Useful…

A: Given: 1Hp=0.7457 kW

Q: e energy cost per onth for operating 15- fluorescent lamp (40 Watts) for 150 hours ea nditioning…

A: Cost of 1 kWh = P 7.00

Q: Explain the difference between energy and power. If a household has an average annual energy…

A: Difference between energy and power? if E=8500 Kwh , find P= ? how power consumptions varies during…

Q: Part An ice cube is placed in a microwave oven. Suppose the oven delivers 135 W of power to the ice…

A: Given data: Power (P) = 135 W Energy (E) = 31200 J Required: Time (t)

Q: 7. Determine the power consumed (in kW) by the heating coil in the following diagram. heating coil…

A:

Q: Determine the amount of electrical energy (in J) used by the following devices when operated for the…

A:

Q: tank contains 303 gallons of oil. This is the equivalent of 4.43×1010 J of energy. How many kWh of…

A: Given that A tank contains 303 gallon of oilThe energy To determine How many KWH of energy does this…

Q: A 680N student runs up a flight of stairs 3.5m high in 11.4 seconds.  The student takes 8.5 seconds…

A: Write the given values with the suitable variables. F=680 Nd=3.5 mt1=11.4 st2=8.5 s Here, F, d, t1,…

Q: What is the useful energy output when a 60 W light bulb is on for 2 hours? Recall, traditional light…

A:

Q: An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a…

A:

Q: An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate…

A: The power of the refrigerator is 400W. The total time operated by the refrigerator is,

Q: The electric motor of a model train accelerates the train from rest to 0.560 m/s in 33.0 ms. The…

A: Given : Initial speed (vi) = 0 because train starts from rest Final speed (vf) = 0.560 m/s Time (t)…

Q: C7 21.) If a hair dryer is rated at 1300 W, how much energy does it require in 6 minutes?…

A: Power=Work/time Work=Power X time

Q: What is the power of a light bulb if it uses 120J of energy in 4.0 seconds? Your answer: O 0.033 W O…

A: Given data : Energy used by light bulb, Time taken,

Q: fluorescent bulb is typically 4 times more efficient than an incandescent bulb. For example, a…

A: Power saved = 60 -15 = 45 W   time =1 year = 365 × 24 × 60  × 60  = 31536000 sec

Q: Consider a building whose annual air-conditioning load is estimated to be 120,000 kWh in an area…

A: Given Annual cooling load        = 120,000 kWh Electricity cost per unit    = RM 0.10 / kWh Air…

Q: A gas-fired turbine generator for production electricity has an efficiency of about 50%. How many…

A: Efficiency is:         η=WQ W is heat output Q is heat given to the system. Amount of heat required…

Q: An average-sized home refrigeration unit has a 1/19-hp fan motor for blowing air over the inside…

A: Given:Fan motor power of refrigeration unit=119 hpFan motor power of blowing air unit=125 hp

Q: b) A modern windmill generates about 1 megawatt of energy, let us say that future ones will generate…

A: Disclaimer: “Since you have asked posted a question with multiple sub-parts, we will solve the first…

Q: What is the wattage of a light bulb that uses 35 J of energy in 7 s?

A: given,  Energy = 35 J  time = 7 s  Therefore, the wattage of the light bulb               =…

Q: The electric motor of a model train accelerates the train from rest to 0.680 m/s in 15.0 ms. The…

A: As per the given data, Mass of the motor (m) = 830 g = 830×10-3 kg; Initial velocity (u) = 0 (rest);…

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: Calculate the number of kilowatt-hours (kW-hrs) consumed in a week by two 60-Watt incandescent light…

A:

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: Q6. Calculate the output power from a module if its efficiency is 31.5 %, input power density is…

A: The efficiency of Solar panel/photovoltaic module : The efficiency of a solar panel/photovoltaic…

Q: How much energy does a 100-W light bulb use in 80.0 hours? O 13 kWh O 800 kWh O 8.0 kWh 0.80 kWh

A: Given data:  Power (P) = 100 W Time (t) = 80.0 h Required: Energy (E)

Q: A sump pump turning at 1600 rpm provides a discharge of 9 gpm against a head of 18 ft. Compute the…

A: Given: From the given data, h=18 ft N=1600 rpm Q=p gpm

Q: A. At 7.15 cents per kilowatt-hour, what does it cost to operate a 9.00 hp motor for 10.0 he? B. At…

A: Total energy used by the motor will be, Emotor=9.0 hp10.00 hr           =9×0.7457 kW10.00 hr…

Q: According to the NEC Table 220.55, what would the demand load be for a range rated 16 kW? Select…

A: Introduction: Table 220.55 gives you the demand factors that can be applies to electric ranges or…

Q: The electric motor of a model train accelerates the train from rest to 0.660 m/s in 16.0 ms. The…

A: The expression form work-energy theorem,

Q: The energy consumed by 2 kW electric motor for 1 minute is Blank 1 Joules.

A: Power of electric motor: P = 2 kW = 2000 W Time interval: t = 1 minute = 60 s

Q: It took an object 50 seconds to move from point A to B, then to CIf point Bis 10 m, east of point A…

A: Time taken for object to go from A to C through B t=50 s, B is 10 m east of A and 5 m west of C at…

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…

Q: What is the work that a 45 W light bulb can do in five minutes? O 390 kJ O 13.5 kJ O 216 kJ O 160 kJ

A:

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.