Effective resistance There are two basic methods of connecting electrical components. Let's look at them both with respect to resistance. When there are multiple resistances in a circuit, we can consider them as a single effective resistance. The method of connecting resistances in a line is called a series connection. We cal- culate the value of the effective resistance in a series connection by totaling the individual resistance values. Effective resistance = R 0 = R 1 + R 2 + ... + R n In this connection, the size of the current that flows in each resistance is the same. The power supply voltage is voltage divided by each resistance. E ective resistance R 0 = R 1 + R 2 + R 3 + ... + R n R 1 V 1 R 2 V 2 R 3 V 3 R n V n co Series ection