Problem description:
Section 1. A brand-new ordinary No.5 dry battery can directly supply power to a 5 ohm light bulb during the discharge experiment, so that the light bulb can work continuously for 75 minutes, and then the dry battery basically fails. At present, the brand's new ordinary No.5 dry battery supplies power to the toy train, which can make the train run continuously for 0.5 hours.
Q (1) What kind of electric energy can a dry cell provide?
(2) The power consumed by the small train
2. On holidays, Xiao Li will test the electric energy consumed by the rice cooker and calculate the electricity bill. So she turned off all the appliances. When the rice cooker started to cook, she counted the revolutions of the turntable of the electric energy meter. It is found that the watt-hour meter turns quickly at 100 rpm, and then turns slowly at 20 rpm to cut off the power supply of the rice cooker. The parameters of the electric energy meter are "220V, 10(20)A, 50Hz, 600rpm /kTWh".
(1) current works through the rice cooker.
(2) Electric energy consumed by the rice cooker
(3) Given that the local electricity price is 0.60 yuan/kWh, what is the monthly electricity bill for Xiao Li to use the rice cooker (calculated by 60 tons)?
Analysis:
Section 1. A brand-new ordinary No.5 dry battery can directly supply power to a 5 ohm light bulb during the discharge experiment, so that the light bulb can work continuously for 75 minutes, and then the dry battery basically fails. At present, the brand's new ordinary No.5 dry battery supplies power to the toy train, which can make the train run continuously for 0.5 hours.
Q (1) What kind of electric energy can a dry cell provide?
Solution: w = (u * u/r) * t =1.5 *1.5 * 75 * 60/5 =
(2) The power consumed by the small train
Solution: P=W/t=
2. On holidays, Xiao Li will test the electric energy consumed by the rice cooker and calculate the electricity bill. So she turned off all the appliances. When the rice cooker started to cook, she counted the revolutions of the turntable of the electric energy meter. It is found that the watt-hour meter turns quickly at 100 rpm, and then turns slowly at 20 rpm to cut off the power supply of the rice cooker. The parameters of the electric energy meter are "220V, 10(20)A, 50Hz, 600rpm /kTWh".
(1) current works through the rice cooker.
Solution: w = (100+20)/600 = 0.2kwh = 0.2 * 3.6 *10 to the 6th power =7.2* 10 to the 5th power.
(2) Electric energy consumed by the rice cooker
Solution: E=W=7.2* 10 to the fifth power.
(3) Given that the local electricity price is 0.60 yuan/kWh, what is the monthly electricity bill for Xiao Li to use the rice cooker (calculated by 60 tons)?
Solution: 0.6*0.2*60=7.2 (yuan)