The resistance value of resistor 1 is 10, and the current expression number is 0.8. After connecting resistor 2, the current expression number is 0.2, and what is the supply voltage and resistance value of resistor 2

The resistance value of resistor 1 is 10, and the current expression number is 0.8. After connecting resistor 2, the current expression number is 0.2, and what is the supply voltage and resistance value of resistor 2

Voltage = 10 × 0.8 = 8V
Total resistance = 8V / 0.2 = 40 Ω
Resistance 2 = 40-10 = 30 Ω
For reference only

If a resistance wire with a resistance value of 50 Oh is energized for 100s and the current passing through is 1a, how much heat is generated by the current passing through the resistance wire and how much power is the resistance at this time

5000J、50W

Resistance of 200 ohm resistance wire, power on for 100 seconds, the current generated by the resistance wire heat how many joules

At least one of the current or voltage should be known
Know the current, use the formula: q = I ^ 2rt
To know the voltage, use the formula: q = u ^ 2T / R
Add good conditions for questioning

If the resistance value is 10, the amount of charge passing through the resistance is 1c in 1s. How much heat is generated when the current passes through the resistance

Current: I = q / T = 1C / 1s = 1A
Heat: q = I ^ 2rt = 1 ^ 2 * 10 Ω * 1s = 10J
I ^ 2 is the square of the current I