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110V 500W electric wire furnace, without voltage protection, directly plug in the 220V voltage, equivalent to how many w electric furnace How to reduce the power on the basis of the original heating wire?
Resistance of electric furnace: r = U ＆ 178 / P = 110 ＆ 178 / 500 = 24.2 (Ω)
Actual power of electric furnace directly connected to 220 V voltage: P real = u real & # 178 / r = 220 & # 178 / 24.2 = 2000 (W)
That is to say, the electric furnace is directly connected to the 220 V voltage, which is equivalent to 2000 W electric furnace
A: slightly
What is the meaning of the electric furnace marked with 220 V or 110 V 500 W
The external rated voltage is 220V, 110V is not our national standard voltage. 500W is 500W
An electric furnace marked with 220 V 500 W
An electric furnace marked with 220 V 500 W (the resistance of the electric furnace wire remains unchanged) is connected to the 220 V power supply with a long and thin wire, and the power consumed on the wire is 10 W, then ()
A. The total power consumed by electric furnace and conductor is 510w. B. the electric power consumed by electric furnace is 490w. C. the electric power consumed by electric furnace is more than 490w and less than 500W. D. the electric power consumed by electric furnace is less than 490w,
The answer is D, because the long and thin wire has resistance. Let R be the resistance, R be the resistance of the electric furnace, and u be the constant voltage. The total power of the electric furnace and wire P1 = u * U / (R + R)
According to the topic, we know that the power of electric furnace P2 = u * U / r = 500W, so P1 is less than 500W, and because the wire consumes 10W of electric power, the power of electric furnace is less than 490w
Xiaoyu bought an electric stove with the specification of 220V 1000W from the shopping mall. Due to the quality problems of some commodities in the shopping mall, Xiaoyu is going to inspect the electric stove at home to see if it can reach the rated power. Please help him think of a simple method to make a judgment as soon as possible
The equipment provided for you is Xiaoyu's electric energy meter, 220 voltage power supply and timer
Electric energy meter: 220 V 10 (20) a, 50 Hz, 2400 R / (kW · h)
KW. H is connected to the watt hour meter to start timing. One hour later, the watt hour meter must display one degree of power, otherwise there is a problem
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