When 3 resistors of 1 ohm resistance each are connected in series to a 12 volt power supply, the total resistance of the circuit is _______ ohms.

The combined resistance of resistors connected in series is the sum of their resistances. Just add the three resistances.

That's right. 1 + 1 + 1 = __ ohms

The voltage doesn't matter.

4 ohm

To find the total resistance of the circuit when three resistors are connected in series, you need to add the individual resistances together.

In this case, each resistor has a resistance of 1 ohm. So when you connect them in series, you add up the resistances:

Total Resistance = Resistance of Resistor 1 + Resistance of Resistor 2 + Resistance of Resistor 3

Total Resistance = 1 ohm + 1 ohm + 1 ohm

Total Resistance = 3 ohms

Therefore, the total resistance of the circuit is 3 ohms.

I hope that explanation helps! Do you have any other questions?