Statement: An electrical circuit has three resistors which three resistors with two having dropped 5 V and 12 V. A current of 50 mA is flowing through the circuit. Find the value of input source?
Solution:
1. Using
color coding chart
, find the value of the resistor, which is 240 ohms in the present case. (Red, Yellow, Brown = 240).
2. Apply Ohm's law to find the voltage across 240 Ω resistor. V = IR = 50 mA * 240 Ω = 12 V.
3. Apply
Kirchhoff's Voltage law
to find the source voltage:
Source voltage = 5 VÂ + 12 V - 12 VÂ + 3 V = 8 V
So the source is 8 V. You should also know the
concept of polarity
for solving this problem.
Learn the
practical lessons of EE.
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