When the voltage applied at both ends of a resistor is 5V, the current passing through it is 0.5A. To make the current passing through the resistor 1a, add it to both ends of the resistor What is the voltage applied at both ends of the resistor? If the voltage at both ends increases to 20V, what is the resistance of the resistor? What is the current passing through it?

When the voltage applied at both ends of a resistor is 5V, the current passing through it is 0.5A. To make the current passing through the resistor 1a, add it to both ends of the resistor What is the voltage applied at both ends of the resistor? If the voltage at both ends increases to 20V, what is the resistance of the resistor? What is the current passing through it?

5*2=10V
5V / 0.5A = 10 Ω
20/10=2A

When the voltage at both ends of the fixed point resistor R increases from 5V to 8V, the current through the resistor R increases by 0.5A. What is the resistance value of the resistor?
Please write down the specific steps to solve the problem

Voltage change 8-5 = 3V, current change 0.5A
The resistance is 3 / 0.5 = 6 Ω

If the voltage applied to both sides of a resistor is 20V and the current passing through it is 0.5A, its resistance is? Ω. If the voltage at both ends of the resistor is 0, its resistance is? Ω
Its resistance is? Ω

R=U\I=20V\0.5A=40Ω
Because the resistance does not vary with the voltage, the resistance is still 40 Ω

When the voltage at both ends of the fixed value resistor R increases from 3V to 4V and the circuit current changes by 0.2A, how much does the electric power of the resistor change?

First of all, according to the meaning of the title, the resistance is calculated: 4V / r-3v / r = 0.2W, r = 5 Ω; the power change is: 4 * 4 / R-3 * 3 / r = 1.4W