The voltage at the ends of the resistor has increased 3 times, while the current strength?

We write the expression for the current for the initial voltage value
I1 = U1 / R.
Current after voltage change
I2 = U2 / R;
U2 = 3 * U1;
I2 = 3 * U1 / R.
Find the ratio of currents
I2 / I1 = (3 * U1 / R) / (U1 / R) = 3/1 = 3.
Answer: the current strength will increase by 3 times.

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