Given:

I1 = 2 amperes

R1 = 5 Ohms

Solution:

E1 = I1 x R1

E1 = 2 amperes x 5 Ohms

E1 = 10 volts

FIGURE 23.

CALCULATING INDIVIDUAL VOLTAGE DROPS IN A SERIES CIRCUIT.

By inspecting the circuit, you can see that R2 is the same ohmic value as R1

and carries the same current. The voltage drop across R2 is therefore also

equal to 10 volts. Adding these two 10 volt drops together gives a total

drop of 20 volts, exactly equal to the applied voltage.

For a series

circuit then:

ET = E1 + E2 + E3 + . . . En

Example: A series circuit consists of three resistors having values of 20

Ohms, 30 Ohms, and 50 Ohms, respectively. Find the applied voltage if the

current through the 30 Ohm resistor is 2 amperes.