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The rated voltage of a DC motor is 220 V and the rated power is 5.5 kW. How big is the current when it works normally? What is the power consumption for 2 hours continuous operation?
(1) When the motor works normally, the current I = Pu = 5.5 × 103w220 v = 25A; (2) the electric energy consumed by the motor for 2 hours is w = Pt = 5.5kw × 2H = 11kw · h. answer: the current of the motor is 25A when it works normally; the electric energy consumed by the motor for 2 hours is 11kw · H
The voltage of energy-saving lamp is 220 V and the current is 4.5 x 10 minus 3 A. how much power does it consume?
P = UI = 220 V × 4.5 × 10 negative cubic = (self calculation)
The rated voltage of an electric iron is 220 V, and the resistance is 1210 Ω when it works under the rated voltage? (2) What is its rated power? (3) How much heat does it produce when it is electrified for 10 minutes at rated voltage?
(1) I = ur = 220v1210 Ω = 211A ≈ 0.18a, (2) P = u, I = 220V × 211A = 40W, (3) under rated voltage, P = P = 40W, q = w = Pt = 40W × 600s = 2.4 × 104j
Connected to the electric iron in the home circuit, the power consumption is 0.5 degrees per hour. What is the working power of this electric iron? What is its resistance? What is the current when it works?
P=0.5kwh/h=500w
R = u ^ 2 / P = (220 V) ^ 2 / 500 W = 96.8 Ω
I=P/U=500w/220v=2.27A
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