Two bulbs are connected in parallel in the circuit, the resistance of 3vl1 is 20 ohm, and the resistance of L2 is 10 ohm. Calculate the current of circuit 2 of 1 bulb L1 and L2

Two bulbs are connected in parallel in the circuit, the resistance of 3vl1 is 20 ohm, and the resistance of L2 is 10 ohm. Calculate the current of circuit 2 of 1 bulb L1 and L2

1. The current of bulb L1 is I1 = u / R1 = 3V / 20 Ω = 0.15A
L2 current I2 = u / r2 = 3V / 10 Ω = 0.3A
2. Trunk current I = I1 + I2 = 0.15A + 0.3A = 0.45a

There are two constant value resistors. Student a said, "I connect these two resistors directly to the two ends of the 6V power supply, and the total power consumed is 4W
According to Yi Tong's theory, "I connect the two resistors and connect them directly to the two ends of the 6V power supply. The total power consumed is 18W." please determine the resistance value of the two resistors according to the description of the two students

The meaning of the title is as follows:
Resistor R1 and R2 are connected in parallel on 6V, P1 = 18W
Series connected on 6V, P2 = 4W
In parallel connection:
R=R1R2/(R1+R2)
P1=U^2/R=36(R1+R2)/ R1R2=18
In series
P2=U^2/(R1+R2)=36/(R1+R2)=4
The solution is as follows
R1 = 6 or 3 ohm
R2 = 3 or 6 ohm
So, these two resistors are 3 ohm and 6 ohm

There is a multi-purpose meter whose center scale value of Ohm scale line is 15. When R × 10 scale is used to measure a resistance to be measured (the resistance value is about 1 & nbsp; 000 Ω), the pointer deflection angle is small. In order to reduce the measurement error, it should be measured again. The order of the experimental steps is as follows______ (fill in the letter). A. turn the selection switch of the multi-purpose meter to the AC high voltage gear. B. connect the two ends of the resistance to be measured with two probes respectively, and read out the data. C. turn the selection switch to the R × 1 gear. D. turn the selection switch to the R × 100 gear. E. adjust the zero resistance to make the pointer of the meter fully offset. F. short circuit the two probes of the ohmmeter

When R × 10 is used to measure a resistance to be measured (the resistance value is about 1 & nbsp; 000 Ω), the pointer deflection angle is small, which indicates that the resistance value to be measured is larger, that is, the selected magnification is smaller, and the larger magnification should be selected. According to the measurement principle and requirements of ohmmeter, the experimental step should be dfeba