What are the readings of the voltmeter if R1 = 3 ohms, R2 = 4 ohms, and ammeter = 0.5 A.

Given:

R1 = 3 Ohm – resistance of the first conductor;

R2 = 4 Ohm – resistance of the second conductor;

I = 0.5 Ampere – current in the electrical circuit.

It is required to determine U (Volt) – the voltage in the electrical circuit.

Since the condition of the problem is not specified, we will solve the problem for two cases: with serial and parallel connection of conductors.

Then, with a serial connection:

U = I * (R1 + R2) = 0.5 * (3 + 4) = 0.5 * 7 = 3.5 Volts.

Parallel connection:

U = I * R1 * R2 / (R1 + R2) = 0.5 * 3 * 4 / (3 + 4) = 0.5 * 12/7 = 6/7 = 0.9 Volts.

Answer: The voltmeter reading will be 3.5 Volts when connected in series, and 0.9 Volts when connected in parallel.