1. One Thing at a Time
Series Circuits

2. Definitions
series circuit – a circuit in which two or more elements are connected end-to-end so that a single loop of current is formed.

3. Series Circuit Rules
equivalent Resistance – more resistors = more resistance
Req = R1 + R2 + …
current – same throughout circuit
I = I1 = I2 = …
voltage – voltages add up
V = V1 + V2 + …
All circuit components and the circuit as a whole must obey Ohm’s Law

4. 5.0 Ω
8.0 Ω
2.0 Ω R1 R2 R3
7.5 V
V (V)
I (A)
R (Ω) R1 R2 R3
Req
2.5
0.5
5.0
4.0
0.5
8.0
1.0
0.5
2.0
7.5
0.5 15

5. 50 Ω
120 Ω
150 Ω R1 R2 R3
1.5A
V (V)
I (A)
R (Ω) R1 R2 R3
Req 75
1.5 50
180
1.5
120
225
1.5
150
480
1.5
320

6. End of – PRACTICE