The small bulb marked "6V 3W" is connected in series with a sliding resistor with a maximum resistance of 10 ohm in the circuit. When the sliding resistor is connected to the circuit with a resistance of 6 ohm, the lamp will light normally Ask: 1: bulb resistance, power supply voltage? 2: How much heat does the sliding rheostat generate when the bulb lights normally for 1 minute?

The small bulb marked "6V 3W" is connected in series with a sliding resistor with a maximum resistance of 10 ohm in the circuit. When the sliding resistor is connected to the circuit with a resistance of 6 ohm, the lamp will light normally Ask: 1: bulb resistance, power supply voltage? 2: How much heat does the sliding rheostat generate when the bulb lights normally for 1 minute?

R=U²/P=6²/3=12Ω
I=U/R=6/12=0.5A
U total = IR total = 0.5 × (12 + 6) = 9V
Q=I²Rt=0.5²×12×60=180(J)

Connect a lamp with 6 ohm resistance to a 9-volt circuit, and the voltage greater than the normal luminous voltage is 6 volts, so as to make the lamp work normally
Connect a lamp with 6 ohm resistance to a 9-volt circuit, and the voltage greater than the normal light-emitting voltage is 6 volts. To make the lamp light normally, how large a resistor should be connected in series? Please answer quickly.

Calculate the normal working current of the bulb from I = u / R:
I=UL/R=6V/6Ω=1A；
R = u / I is obtained from I = u / R, and the resistance value to be connected in series is calculated
R'=U'/I=(U-UL)=(9V-6V)/1A=3Ω

There is a resistance line. When 1 V is applied at both ends of the resistance line, the resistance value is 0.5 ohm. If 10 V is applied at both ends of the resistance line, the resistance value should be ()
A. 0.5 ohm B. 5 ohm C. 0.05 ohm D. 20 ohm

It is known that the resistance value of the resistance wire is 0.5 ohm. When the voltage at both ends of the resistance wire changes, the resistance value remains the same, which is still 0.5 ohm

If a resistance R = 100 ohm, in order to make 1 / 5 of the total current pass through R, a resistance connection with ohm resistance value should be taken; if the voltage at both ends of it is equal to the total voltage
1 / 4, you need a resistance value of Ohm connected to the circuit

First question:
In parallel circuit, the ratio of current flowing through each branch is inversely proportional to the resistance
Second question:
In a series circuit, the voltage at both ends of each resistor is proportional to its resistance. A resistor needs to be connected in series, and its resistance value is 3 × 100 = 300 ohm