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How many watts is the host power supply 220 V 4.0 a 50 Hz
Power supply, marked with rated power
The electric hair dryer is marked with the words of 220V 1100W. It normally works for 10min and consumes electric energy J. what is its resistance
The standard of electric hair dryer works normally for 10 minutes, and the power consumption is w = Pt = 1100W * 10 * 60s = 660000j
Its resistance R = u ^ 2 / P = (220 V) ^ 2 / 1100 w = 44 Ω
Function of diodes between high and low speed switches of blower
What is the function of diode? How does it control high and low speed
It is a half wave rectifier. When the diode is not connected in series, both the positive and negative half cycles pass through. The diode in series only passes through the positive half cycle. The effective value of voltage is half of the original value, so the purpose of speed regulation is achieved
A 220 V power supply S1 is the main switch, the motor is connected in parallel with S2 and the heating wire, the power of hot air is 880W, and the power of cold air is 80W
When S2 is closed, the heat of the hair dryer working for 5 minutes
(880-80) w × 5 × 60s = 2400000 joules
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