Heat energy is often measured in calories and 1 calorie = 4.184 Joule. It is desired to design a heating element to boil a certain amount of water in 2 min requiring 40-kcal heat energy. If the heater is to operate at 110-V, calculate
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Heat energy is often measured in calories and 1 calorie = 4.184 Joule. It is desired to design a heating element to boil a certain amount of water in 2 min requiring 40-kcal heat energy. If the heater is to operate at 110-V, calculate its current and power ratings.
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- Suppose the cost of an incandescent bulb is 28 cents and that electricity costs 10.5 cents/kWh. Compact fluorescent lightbulbs (CFL), while they are more expensive, use 1/10 of the power for the same amount of illumination. What would be the maximum cost (in dollars) of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60 W bulbs? Assume both lightbulbs run for 1000 h.An electric heater having power rated 1000W connected to a 240V supply for 10minutes. a) calculate the conductance of the heater element.b) Find the nett charge flowing in the heater element.c) Calculate the no. of free electron that represent for that amount charge obtained.A static electrical device has 2000 turns uses 4000 mA from the supply connected to a laptop whichhas a power of 20 V, 1000 W. How can you find the amount of current used by the laptop? Identify suchstatic electrical device used and evaluate supply voltage taken by it. Which category does it belong basedon its ability to change voltage? Practical efficiency of such electrical device is less than 100 %. Justifywith reasons. What are possible ways to improve its efficiency?
- An electric heater having power rated 1000W connected to a 240V supply for 10minutes. a) Determine the heat energy produced of the electric heater. b) Calculate current taken from the supply. c) Find the resistance value of the heater element. d) Calculate the conductance of the heater element. e) Find the nett charge flowing in the heater element. f) Calculate the no. of free electron that represent for that amount charge obtained.Batteries typically have ratings stated in ampere-hours, that let you estimate the length of time any particular current level can be delivered before discharging. How much energy is approximately stored by a fully charged 50 A-hour, 12 V battery? Assuming 100% efficient energy conversion, how much water stored behind a 30 m high hydroelectric dam would be required to charge the battery?1.) An incandescent lamp, rated at 100 watts, gives a certain amount of light when placed across the 120V ac power line. Would the amount of light increase, decrease or remain the same, when the lamp is placed across a 120V dc power line? Discuss. 2.) Explain what is meant by effective current and effective voltage.
- A pot of water is heated by transferring 1676 kJ of heat energy to the water. If there is 5.00 kg of water in the pot, and the temperature is raised by 80.0 K, what is the specific heat of water in J per kg Kelvin? Your answerCompute for the time it takes for an electric stove to consume 60 kJ for a 220-V line drawing 30 A of current.. Let us given a 12V, 60 Ah car battery. If the total energy of the battery reduces to 40% or less of the full charge, the battery cannot supply energy to the car, that is, the battery is discharged. The alarm system installed on the car draws a 100 mA current. How long can the car be parked before the battery is discharged?
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