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

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

The specifications are 220 V 200 W of an electric fan, a television, and an electric iron respectively end the home circuit, power on time
Put an electric fan, a TV set, and an electric soldering iron of 220 V and 200 W in the home circuit respectively, and the power on time is the same, which one produces more heat?

Electric soldering iron

Two incandescent lamps with rated value of "220 V, 100 W" and "220 V, 25 W" are connected in series to 220 V power frequency AC power supply, and their brightness is as follows:
(a) 100W bulb is brighter (b) 25W bulb is brighter (c) both bulbs are brighter

(b) When the 25W bulb is brighter, the actual power is higher when the nominal power is lower in series, and vice versa when the bulb is connected in parallel

There are two incandescent lamps with rated voltage UN = 220 V and rated power PN of 100 W and 25 W respectively. After connecting them in series to 220 V power supply, which lamp will be on

According to the power P = u ^ / R, the resistance of two incandescent lamps can be calculated as: 100W: 220 * 220 / 100 = 484 ohm, 25W: 220 * 220 / 25 = 1936 ohm, and the total resistance in series is 2420 ohm
From this, the partial pressure of 100W after series connection is 220 * (484 / 2420) = 44V, and the partial pressure of 25W is 220 * (1936 / 2420) = 176v
So the 25W light must be on