If the rated power of a bulb is 10W and the resistance is 10 Ω, the rated voltage of the bulb is______ In order to connect the lamp to a 12V power supply and make the lamp work normally, one needs to be connected in series______ Ohm resistance | Math enthusiast | Mathematical art

If the rated power of a bulb is 10W and the resistance is 10 Ω, the rated voltage of the bulb is In order to connect the lamp to a 12V power supply and make the lamp work normally, one needs to be connected in series Ohm resistance

(1) Rated voltage of the bulb: u = P, r = 10W × 10 Ω = 10V; (2) when the lamp is connected to a 12V power supply, the current in the circuit is I = u, r = 10v10 Ω = 1a, the voltage at both ends of the series resistor is U-U, r = 12v-10v = 2V, and the resistance of the series resistor is r = u, I = 2v1a = 2 Ω

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