What would a voltmeter measure in a circuit with R1 = 20 ohms, R2 = 20 ohms, and R4 = 20 ohms when supplied with 12V?

To determine what a voltmeter would measure in this circuit, first, it’s essential to understand the configuration of the resistors and how voltage is distributed across them. Assuming R1, R2, and R4 are connected in series, the total resistance in the circuit would be the sum of all resistors:

Total Resistance (R_total) = R1 + R2 + R4 = 20 ohms + 20 ohms + 20 ohms = 60 ohms.

Using Ohm’s Law (V=IR) to find the total current in the circuit when a 12V supply is applied:

Total Current (I) = V / R_total = 12V / 60 ohms = 0.2 A.

Now, voltage drop across each resistor in a series circuit can be calculated using the formula V = I * R. For the resistor R2, which has a resistance of 20 ohms:

Voltage across R2 = I * R2 = 0.2 A * 20 ohms = 4 volts.

The voltmeter would measure the voltage across the specified resistor, R2, which is 4 volts. This confirms that the answer provided is indeed accurate, reflecting the