1. Resistive Circuits Resistors in series Resistors in parallel
Voltage divider
Current divider
The bridge

2. Electrical resistance
Resistor’s obey Ohm’s Law:
V = I R
The voltage “drop” across a resistor is linearly proportional
to the current passing through the resistor

3. Resistors in series

4. Resistors in parallel

5. Voltage divider

6. Current divider

7. A series-parallel connection

8. The bridge The bridge is “balanced” when the ammeter reads zero
If ammeter current = 0, I1 = I3 and I2 = Ix
The points A and B are at the same potential
So I3R3 = IxRx and I1R1 = I2R2

9. Classwork #1
Find the total current emitted by the voltage source