The resistance of a resistance wire is 1000 ohm. The maximum allowable voltage is 1a. When the voltage is 220 V, how to make a maximum power electric heater

The resistance of a resistance wire is 1000 ohm. The maximum allowable voltage is 1a. When the voltage is 220 V, how to make a maximum power electric heater

The resistance of human body is generally between 1000 ohm and 2000 ohm. We take 1500 ohm. If a certain discharge is between the cloud and the earth, the voltage will reach 5 million v
How much current can the human body produce

U = 5mv = 5000000v
Current: I = u / r = 5000000 / 1500 ≈ 3333.33 (a)
A: slightly

There is a nominal "220 V 100 W" bulb, when the actual voltage of the grid is only 200 v
There is a nominal "220 V 100 W" bulb, when the actual voltage of the power grid is only 200 V, if the influence of temperature on the filament resistance is considered, the actual power consumption of the bulb is low
A. Greater than 82.6w B. equal to 82.6w
C. Less than 82.6w D. equal to 90.9w

Answer: a
When the voltage decreases, the current decreases, the filament temperature decreases and the filament resistance decreases, so the power is slightly higher than that when the filament is constant

An electric fan, a TV set and an electric iron with the specifications of "220 V & nbsp; 100 W" are respectively connected into the 220 V circuit. The power on time is the same, and the heat generated by the current passing through them is the most: ()
A. Electric iron B. TV C. electric fan D. as much

∵ u = 220 V, ∵ the actual power of three kinds of electrical appliances: P = P = 100 W; and ∵ w = Pt ∵ the electric energy consumed by the three kinds of electrical appliances is the same; ∵ the television converts part of the electric energy into light energy, the motor in the electric fan converts most of the electric energy into mechanical energy, and the electric iron converts all of the electric energy into internal energy