The current in the wires of a circuit is 120.0 milliamps. If the voltage impressed across the ends of the circuit where tripled (with no change in its resistance), then its new current would be how amps

Current in a wire is 120mA

I = 120mA = 120 * 10^-3 A

I = 0.12 A

If the voltage applied at across the wire is tripled

From ohms law

V=IR

R = V / I

Since R is constant

Then,

V / I = K

Then, we can say

V / I = V' / I'

Given that,

Initially

V = V and I = 120mA

Then, V' = 3V and I' = ?

So,

V / I = V' / I'

V / 120 = 3V / I'

Cross multiply

V * I' = 120 * 3V

Divide both sides by V

I' = 120 * 3V / V

I' = 360mA

So, the current in the wire when the voltage was tripled is 360mA, the current was also tripled