The current is 1a and the voltage is 5V. How many resistances do you need to reduce the voltage to 4, 3, 2 and 1V

The current is 1a and the voltage is 5V. How many resistances do you need to reduce the voltage to 4, 3, 2 and 1V

two thousand three hundred and forty-five

In a circuit, if the voltage is 0.1V and the current is 1a, how much is the resistance? If the unit is converted to Ma level, how much is the resistance? If r = 0.1v/1a = 0.1 ohm, if r = 100mV / 1000mA = 0.1mohm, how can this happen?

First of all, your r = 0.1 calculation is also correct. The second step is converted to milliampere level calculation, your unit is wrong. It is still 0.1 ohm. Because MV / MA = V / a = ohm, the unit M can be eliminated up and down. So there is no m in the result, only ohm

The voltage at both ends of the wire is 2V and the current is 0.1A. If 4V is added at both ends of the wire, what is the resistance of the wire? What is the current passing through?

When the voltage changes, the resistance remains the same, so the resistance is r = u / I = 2V / 0.1A = 20 Ω
Through current I = u / r = 4V / 20ohm = 0.2A
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