电功、电功率练习题(2002(国外英文资料).docVIP

电功、电功率练习题(2002(国外英文资料) Documents from the network, I collected, finishing, and if there are omissions, errors, but also please correct me! Exercises for electrical and electrical power (2002.11) Lixin school First, fill in the blanks: (2 cents per hour, 46 points) 1., R1, R2 two resistance value of different fixed resistance into the circuit, known R1 at both ends of the voltage is U1, R2 at both ends of the voltage is U2, through the R1, R2 current are I1, I2 If U1=U2, then P1:P2=, if I1=I2, then P1:P2= 2. in the family circuit, the meter is used to measure the energy consumed by the user An electric kettle marked with 220V 2000W operates normally for 3 minutes and consumes kilowatt hours of electricity The intersection of 3. city are usually equipped with red, yellow and green lights to command vehicles and pedestrians pass, if each lamp specifications are 220V 300W, then each traffic light (including red, yellow and green three colors of light) 15 hours of work to electricity consumption of coke 4. of the existing resistance are two resistance 10 in Europe, 15 in Europe, to allow the maximum current which is respectively 1 and 0.6, if they are used in series, the maximum voltage at both ends is allowed to add V, the maximum power circuit is w 5., the following table is the domestic washing machine manual data, which shows that the washing machine normal work current is an, and if the laundry, dehydration accumulated 1 hours, then the washing machine power consumption is kWh Rated voltage Rated washing and dehydrating power Laundry capacity 220 volts 440 watts 5 kilograms 6., a 12V, 6W small bulb, if received 36 volts power supply, in order to make it normal light, you need to connect a resistance to the value of resistance, the power consumption of the resistor is 7. in the circuit shown in Figure 1, L1 and L2 are marked 220V 25W respectively And 220V 40W bulbs, in order to make the lights are normal, should be closed Switch, to make the light LI brighter than L2