BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
Substituting values from the circuit:
Ex + 15 volts + 25 volts - 50 volts = 0
Ex - 10 volts = 0
Ex = 10 volts
FIGURE 28.
DETERMINING UNKNOWN VOLTAGE IN A SERIES CIRCUIT.
The unknown voltage (Ex) is found to be 10 volts.
Using the same idea as above, you can solve a problem in the which the
current is the unknown quantity.
Example: A circuit having a source voltage of 60 volts contains three
resistors of 5 Ohms, 10 Ohms, and 15 Ohms. Find the circuit current.
Solution: Draw and label the circuit (figure 29 on the following page).
Establish a direction of current flow and assign polarities. Next, starting
at any point (point A will be used in this example) write out the loop
equation.
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