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A and B bulbs are respectively marked with the words "220 V 40 W" and "220 V 60 W", which are connected in parallel with the 220 V power supply. What is the resistance of B
P=U^2/R
60W=220V*220V/R
R = 807 Ω
The resistance value of the resistance wire is 200 ohm. What is the resistance of connecting it to a circuit with a voltage of 220 V
Take it out and put it on the table. What's the resistance? Divide it into four equal length segments. What's the resistance of each segment? If the four segments are twisted into one strand, what's the resistance
Resistance is an inherent characteristic of an object, which is only related to its own resistivity and size, so the resistance value is the same no matter how much voltage is applied or not
The resistance of the conductor is directly proportional to its length, so after it is divided into four sections, the resistance of each section is 200 / 4 = 50 ohm
Four sections twisted into a strand, equivalent to four 50 ohm parallel, resistance = 50 / 4 = 12.5 ohm
A resistance wire resistance is 100 ohm, connected to 220 V voltage, how much current flowing through her
From I = u / R, it is obtained that:
I = 220 / 100 A = 2.2 A
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