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Bulbs L1 and L2 are respectively marked with the words "220V 25W" and "220V 15W". If the two bulbs are connected in series and connected in the home circuit, the voltage ratio of the two lamps is______ What is the ratio of the current passing through______ What is the ratio of the actual power consumed______ The brighter light is______ If they are connected in parallel in a home circuit, the voltage ratio of the two lamps is______ What is the ratio of the current passing through______ What is the ratio of the actual power consumed______ The brighter light is______ ．
The filament resistance of the two bulbs are R1 = u2p1 = (220 V) 225 w = 1936 Ω, R2 = u2p2 = (220 V) 215 w ≈ 3227 Ω. If the two bulbs are connected in series and connected in the home circuit, ∵ u1u2 = r1r2, ∵ the voltage ratio of the two bulbs is 1936 Ω, 3227 Ω = 35; ∵ I = I1 = I2, ∵ the current passing through is
In the series circuit, there are two small bulbs. It is known that the rated voltage of L1 is 220 V, the rated power is 100 W, the rated voltage of L2 is 220 V, and the rated power is 40 W?
R1 = U1 forehead & sup2 / P1 forehead = (220V) & sup2 / 100W = 484 Ω, normal luminous current I1 = P1 forehead / U1 forehead = 100W / 220V = 5 / 11a
R2 = U2 forehead & sup2 / P2 forehead = (220V) & sup2 / 40W = 1210 Ω, normal luminous current I2 = P2 forehead / U2 forehead = 40W / 220V = 2 / 11a
I1 ＜ I2, the maximum current allowed to be added in series is I = 2 / 11a (without damaging the bulb)
Maximum voltage of power supply u = IR = I (R1 + R2) = 2 / 11a * (484 Ω + 1210 Ω) = 308v
Two bulbs are connected in series in a 220 V circuit. Their rated voltage is 220 v. the rated power of L1 is 100 W, and that of L2 is 20 W. which bulb is on
If the rated power of L1 is 100W, the resistance of L1 is R1 = 220 / 100 = 484 ohm and that of L2 is 20W, the resistance of L2 is R2 = 220 / 20 = 2420 ohm. If two bulbs are connected in series in the circuit of 220V, the current of the two bulbs is the same. If the voltage is proportional to the resistance, the voltage at both ends of L2 is large, so L2 is on
The normal working voltage of a small festival lantern is 6.3V. If you want to connect this kind of lantern to the home circuit (the power supply voltage is 220V) for decoration, the answer is that there are 35 channeling connections, that is, 220V / 6.3 ≈ 34.9. I want to ask: the voltage of each small bulb in the channeling connection circuit is not necessarily equal, why is 35 channeling connections OK?
Each bulb has the same resistance and the same voltage
RELATED INFORMATIONS
- 1. The rated voltage of a color lamp is 36V. It needs to be connected to the circuit of 220V. How many such bulbs are connected in series to work normally Why is 220 divided by 36 equal to 7? Isn't 36 multiplied by 7 more than 220 V
- 2. In festivals, we install colored lights. Now we have dozens of colored light bulbs on hand. When we work, the voltage at both ends is not more than 6.3V. We can only use the home circuit to supply power. The feasible way is () A. Connect 34 lights in series to the circuit B. connect 34 lights in parallel to the circuit C. connect 35 lights in series to the circuit D. connect 35 lights in parallel to the circuit
- 3. From the power supply with voltage of 220 V to an electric lamp marked "pz220-60" in a distant construction site, because the power supply wire has resistance The actual power consumed by the bulb is 55W. Then 1. The resistance of the filament? 2. The actual voltage at both ends of the bulb? 3. The electric power consumed by the wire?
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- 5. Connect two light bulbs marked with 220v100w and 220v60w in series to the 220 V power supply. What is their actual power,
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- 7. There is a festival lantern made of 20 small bulbs in series. If the current at the power plug is 200mA, then the current through each small bulb is 200mA______ mA．
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- 10. Connect the 220 V, 100 W small bulb to both ends of the 200 V power supply, can the small bulb work normally? What is the actual power of the bulb at this time?
- 11. After connecting two "220 V, 60 W" bulbs in series and connecting them at both ends of the 220 V circuit, what is the actual total power of the two lamps?
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- 13. How much is the rated current of two 220 V 100 W bulbs connected in series in 220 V circuit?
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