#OCENAUDIO KEYBOARD SHORTCUT SILENCE PORTABLE#
#POWER FORMULA PHYSICS CALCULATOR PORTABLE#Įfficiency = useful energy out ÷ total energy inĪ portable speaker coverts 150J of electrical energy into 30J of sound energy.Only 400J of kinetic energy was generated by the drill. Traditional, filament light bulbs use electricity flowing through a thin piece of wire called a filament. The filament gets hot and glows, producing light. As a lot of heat is also produced, filament bulbs are not very efficient.Įnergy saving light bulbs do not use this method and are more efficient. This means that, for the same amount of electrical energy, the energy saving bulb will produce more light than the filament bulb.Įnergy saving bulbs are usually more expensive to buy compared to filament bulbs. However, the energy saving bulb has a much longer lifetime than the filament bulb, which will need to be replaced regularly. Because the filament bulb is less efficient, the cost of electricity for the filament bulb will be much higher than the energy saving bulb. So, although the energy efficient bulb has a higher initial cost, it will save money in the long term. A or B? Which of these devices uses the most energy? A - a 2kW heater used for 4 hours. In other words, efficiency is the ratio of energy output by energy input. B A or B? Which of these devices uses the most energy? A - a 1kW iron used for 1 hours. Formula to calculate efficiency: Efficiency Physics Formula. A An electric motor uses 275J to lift a load in 5s. What is the power of the motor? Your answer should include: 55W / 55 What is the efficiency of a 60W lightbulb that produces 3W of light? 0.When work is done on an object, energy is transferred. The rate at which this energy is transferred is called power. The equation used to calculate the power is: So the more powerful a device is, the more energy it will transfer each second. Since twice as much energy is transferred by motor one each second, it is possible to say that motor one is twice as powerful as motor two. QuestionĪ hairdryer transfers 48,000 J of energy in one minute.
#POWER FORMULA PHYSICS CALCULATOR PORTABLE#.
0 kommentar(er)
