Final answer:
Using Ohm's Law, the calculated voltage needed to produce a current of 1.4 Amps in a circuit with a resistance of 4.0 Ohms is 5.6 Volts.
Step-by-step explanation:
To find the voltage that will produce a current of 1.4 Amps in a circuit with a resistance of 4.0 Ohms, we can use Ohm's Law, which states that Voltage (V) equals the product of the current (I) and the resistance (R), expressed as V = I * R.
So, we multiply the current of 1.4 Amps by the resistance of 4.0 Ohms to get the voltage. The calculation looks like this:
Voltage = 1.4 A * 4.0 Ω
Voltage = 5.6 V
Therefore, a voltage of 5.6 Volts will produce a current of 1.4 Amps in the circuit.