Answer Key: Ohm's Law Exercise 1


A.] Given a dc circuit that has two resistors connected in series (R1=100 ohms, R2 = 150 ohms).

1. Determine the source voltage if the ammeter reads 20 mA.
5V

2. Determine the total resistance.
250 ohms

3. Determine the Current flow in R1.
20 mA

4. Determine the Current flow in R2.
20 mA

5. Determine the voltage across R1.
2V

6. Determine the voltage across R2.
3V

7. Determine the total current flow in the circuit.
20 mA


B.] Given a dc circuit that has two resistors connected in parallel (R1=100 ohms, R2 = 150 ohms).

1. Determine the total current if the voltmeter reads 10 Volts across R1.
166.67 mA

2. Determine the total resistance.
60 ohms

3. Determine the Current flow in R1.
100 mA

4. Determine the Current flow in R2.
66.67 mA

5. Determine the voltage across R2.
10 V

6. Determine the source voltage.
10 V

7. Determine the total current flow in the circuit.
166.67 mA


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