There are three resistors, R1 = 8 ohm, R2 = 12 ohm, R3 = 20 ohm. Connect them in series with a 10 volt power supply. What is the voltage at both ends of the three resistors?

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• 1. If resistance R1 is connected to a circuit, the power consumed is P1; if another resistance R2 is connected to the same circuit in series, the power consumed by R2 is P2. If P1: P2 = 4:1, R1 "select" greater than "," less than ", or" equal to "R2
• 2. Connect two fixed value resistors in series to both ends of the power supply with voltage of u, the power consumed by R1 is P1, and the power consumed by R2 is 3P1 A. The ratio of voltage between R1 and R2 in series is 3:1b. The power consumed by R1 in parallel is 16p1c. The ratio of current through R1 and R2 in parallel is 1:3d. The total power consumed by two resistors in parallel is 163p1
• 3. If the two constant resistors R1 and R2 are connected to the power supply in some way, the power consumed by R1 is 9W, If the two resistors are connected to the power supply in another way, the power consumed by R1 is 16W, and the current passing through R2 is 4a. If the power supply voltage remains unchanged, what is the power supply voltage and the resistance of r1r2
• 4. Two fixed value resistors R1 and R2 are connected in parallel and connected to the circuit. Their electric power is P1 and P2 respectively, and the total power is p. try to prove that P = P1 + P2
• 5. The power supply voltage is 6V, the resistance R1 = 5 ohm, and the maximum resistance of rheostat R2 is 10 ohm Find out the change range of voltmeter and ammeter
• 6. After resistor R1 and R2 are connected in parallel, they are connected to the power supply with voltage u, and the main circuit current is I. The current passing through R1 and R2 is I1 and I2 respectively. It is tried to prove that I1 = [R2 / (R1 + R2) Try to prove that I1 = [R2 / (R1 + R2)] I That is to say, I1 is equal to R2 divided by the sum of R1 and R2, and then multiplied by I}
• 7. Two resistors R1 and R2 are connected in parallel in the circuit. If the current I1: I2 passing through the resistor R1 and R2 is 4:3, the voltage ratio at both ends of the resistor R1 and R2 is () A.4:9 B：1:1 C.3:2 D.2:3
• 8. In equilateral triangle circuit, corresponding to three resistors, known as U1 = U2 = U3 = 380V, R1 = R2 = R3 = 48 ohm, calculate I1, I2, I3
• 9. The unit of force is, abbreviated as, symbol
• 10. It is often used in science to show force directly
• 11. A small electric bell with a resistance of 10 ohm is connected in series with a fixed resistance of 20 ohm and connected to a 6V power supply. If the small electric bell just works normally, what is the voltage at both ends of the electric bell?
• 12. Generally speaking, when the load resistance decreases, the load increases, and the power output power increases (×), how to explain
• 13. The electromotive force of the power supply is 2V and the internal resistance is 0.1 ohm. When the external circuit is open, the current and terminal voltage in the circuit are
• 14. It is known that R1 = 10 Ω, R2 = 20 Ω. If they are connected in series and connected to a 6V power supply, the power consumption of resistor R1 and R2 per minute is If they are connected to the same power supply, the work done by the current to r1r2 per minute is
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• 17. One day, Xiao Ming found that an old incandescent lamp marked "220 V & nbsp; & nbsp; 40 W" was dim. He ran to the corridor to observe the electric energy meter, and measured the electric power of 1200 W with his watch. (1) "it can't be the electric power of the incandescent lamp!" Xiaoming checked that the reading and calculation were correct, and the watt hour meter and watch were accurate. With the help of his father, the voltage at both ends of the incandescent lamp was measured to be 220 v. please analyze the cause of this error______ (2) after analyzing the cause and correcting the error, Xiao Ming measured again that the electric power of this lamp is 36W. The reason why the actual power of the incandescent lamp is lower than the rated power is that______ ．
• 18. What is the heating rate of the electric heating wire in the hair dryer
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