1. Series Circuits

2. Ohm’s Law Review Ohm’s Law states that Voltage = Current x Resistance
V = IR

3. Total Resistance in a Series Circuit
The total resistance in a series circuit is equal to the sum of the individual resistances in the circuit.
Rtotal = R1 + R2 +R3 + …….

4. Sample Problem A B C
12V 3 2 4
What is the total resistance across the circuit shown above?

5. Total Current in Series Circuits
The current at every point in a series circuit is the same.
Itotal = Vbattery / Rtotal

6. Sample Problem What is the total current on the circuit shown above? B3 2 4
What is the total current on the circuit shown above?

7. Total Voltage in Series Circuits
The total voltage is equal to the voltage across each component.
Vtotal = V1 + V2 + V3+ ….
To find the voltage across one component:
V1 = ItotalR1

8. Sample Problem Find the total voltage across the circuit shown.3 2 4
Find the total voltage across the circuit shown.
Find the voltage across resistor B.