High School

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Immediately after the switch is closed, the current through the resistor is measured to be [tex]i = 1.5 \, A[/tex]. What is the unknown battery voltage?

A. 3 V
B. 4.5 V
C. 6 V
D. 9 V

Answer :

Final answer:

Immediately after the switch is closed, the current through the resistor is measured to be i = 1.5 A, the unknown battery voltage is 2.25V. Hence, none of the options are correct.

Explanation:

The unknown battery voltage can be determined by analyzing the circuit and applying Ohm's law.

The total current drawn from the battery can be found by summing the currents through each resistor.

Since the current through the resistor is measured to be i = 1.5 A, and the resistance is the same as the unknown battery, we can set up the equation as follows:

V = i * R

V = (1.5A)(1.5Ω)

V = 2.25V.

Therefore, the unknown battery voltage is 2.25V. Hence, none of the options are correct.

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