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The more work the current does per unit time, the greater the electric power, right?
Electric power P = w / T, w = IRT * t, so p = IRT, that is, the more work the current does in unit time, the greater the electric power
Is the amount of work done by the current related to the electric power
The physical quantity indicating the work done by current is electric work W, and w = Pt. Thus, the work done by current is related to electric power and power on time. Therefore, the work done by current is related to electric power
The correct statement about power is: the more work a does, the greater the power; the shorter the time B does, the greater the power; the faster the work C does, the greater the power
The longer it takes d to do the same work, the greater the power
P=W/t
W / T is the work done per unit time (similar to speed: the distance traveled per unit time). It represents the speed of work (speed is the speed of an object's motion)
Is electric work a physical quantity indicating the speed of work done by the current or a physical quantity indicating the amount of work done by the current?
A physical quantity indicating the work done by an electric current
Ask weakly: "why do we say that electric power is a physical quantity that indicates how fast the current does work?"
Work done by electric current w = uitah, with electric current, P = w / T = UI, with electric current, P = w / T is to calculate all power, including electric power, P = UI is just to calculate electric power, which is not clear
RELATED INFORMATIONS
- 1. The following statement about electric power is correct () A. Electric power is a physical quantity indicating how much work is done by current. B. The more electric energy consumed by electrical appliances in the same time, the greater the electric power. C. when several bulbs in series work, the electric power of bulbs with large resistance is smaller. D. the more work done by current, the greater the electric power
- 2. In the same time, the greater the current in the appliance, the more work the current does? Is that right? Why not
- 3. What time units, seconds and hours are used to calculate electric power
- 4. Physics problem about electric power 220V 100W In 110 V circuit Find r =? P=? Heat generated in 1min? Please write down the detailed process (formula used) Please, we have to write the process
- 5. Xiaoqiang designed an electric kettle, the circuit is as shown in the figure, s is the temperature control switch, R1 is the heater. When the switch S is connected to a, the electric kettle is in the heating state, and the electric power of the heater is 1000W; when the water is boiling, the switch S automatically switches to B, and the electric kettle is in the insulation state, and the electric power of the heater is 160W (1) Please calculate the resistance value of R1 and R2 (regardless of the influence of temperature on the resistance value) (2) in order to make full use of electric energy, on the premise of not changing the circuit connection method, please put forward reasonable improvement methods for the design of Xiaoqiang
- 6. In the circuit, the power supply voltage is constant. R1 is a certain value resistor, R2 is a sliding rheostat. After the switch S is closed, when the slide rheostat picture P slides before a and B, the maximum indication of voltmeter is 4V. The electric power variation range of resistor R1 is 0.8W ~ 7.2W, then when the slide rheostat picture moves back and forth, the indication range of current scale is? Circuit diagram: the power switch a R1 R2 is connected in series V to measure the voltage of R2
- 7. All the formulas in the chapter of electric power
- 8. And knowledge points
- 9. Can Ohm's law and Joule's law only be used in pure resistance circuits? Why?
- 10. Electric power: practical problems The resistance of a light bulb L is 10 Ω, which can normally light up under the voltage of 6V. Now connect the light bulb to 9V constant voltage power supply. In order to make the light bulb normally light up, connect a suitable resistance R in the circuit. How do you think to connect the resistance? What is the resistance value of the resistance R? The resistance of a light bulb L is 10 Ω, which can normally light up under the voltage of 6V, Now connect the bulb to 9V constant voltage power supply. In order to make the bulb shine normally, connect a suitable resistance R in the circuit. How do you think to connect the resistance? What is the resistance value of the resistance R?
- 11. How to calculate the electricity consumption per hour?
- 12. The electric energy meter can be used to measure the hourly electricity consumption of electrical appliances. Xiao Li wants to know the hourly electricity consumption of the hair dryer used by his hairdresser. He only knows that his rated voltage is 220 V, and there is no other data. Please use the general household electric energy meter [the data on the nameplate is as follows: 220 V 1325 kW · h 2.5 (5) a 50 Hz A simple method is designed to help Xiao Li calculate the hourly power consumption of this hair dryer Fast, fast, good answers plus points
- 13. The electric energy meter is marked with 3000r / kW · h. The primary electric appliance works alone, and the dial turns 150 turns in 10 minutes to calculate the electric power of the electric appliance
- 14. The panel of household electric energy meter is marked with 3600 rpm, which is connected to a 220 V 40 W electric appliance. When it works normally, the power of the electric energy meter will be reduced within one minute
- 15. Use an energy meter to measure the hourly electricity consumption of household appliances Give me the measured data, calculation process and results,
- 16. What kind of instrument is an electric energy meter
- 17. What is the symbol of kilowatt hour?
- 18. At present, the electricity price of a city's residents is 0.52 yuan / kWh. The residents who install time-sharing meters implement electricity price. The charging standard is shown in the following table: Peak time (8:00-21:00) valley time (21:00-8:00 the next day) Hourly electricity price per kilowatt / RMB 0.55 0.35 Xiaogang's monthly electricity consumption is 140 kwh, and the valley hour electricity consumption is 3 / 7 of the total monthly electricity consumption? If a time-sharing meter is installed, how much is the electricity charge this month?
- 19. In order to encourage the public to save electricity, a municipal power company has stipulated the following calculation method of electricity charge: the monthly electricity consumption is not more than 100 kwh, and the charge is 0.52 yuan per kWh, If the monthly electricity consumption exceeds 100 kwh, the excess part will be charged at 0.6 yuan per kWh. Xiaomin's family paid 64.9 yuan in September. How many kwh did her family use in September?
- 20. In order to encourage energy saving, a city power company has stipulated the following calculation method: the monthly electricity consumption is not more than 100 kwh, and the charge is 0.52 yuan per kilogram hour If the monthly electricity consumption exceeds 100 kwh, the excess part will be charged at 0.6 yuan per kWh. Xiao Ming's family paid 64.4 yuan in October, and how much kwh is the electricity consumption? (the result is kept in integer),