1. What if…?

2. Starter:
The current through the 9 kΩ resistor is 70 mA. Calculate the power output of the 5 kΩ resistor.
5 kΩ
9 kΩ
7 kΩ

3. Potential Divider (Voltage Divider)

4. Describe how increasing R1 would affect A1, V1, V2 and V3
10 Ω V1
20 V V3 R1 V2

5. Potential Divider (Voltage Divider)
The total voltage is “divided” into V1 and V2
Increasing R1 would:
Increase V2
decrease V1
(V3 = V1 + V2)

6. Potential Divider (Voltage Divider)
The total voltage is “divided” into V1 and V2
The voltage applied to the light bulb can be controlled by changing R1

7. EXAMPLE: Calculate V1 and V2 when: R1 = 0 Ω R1 = 50 Ω R1 = 10 Ω

8. Practical – Light Detector
Task: build a simple “light detector” circuit by using a light bulb and a LDR (Light Dependent Resistor)
LDR

9. Worksheet #5
HW Booklet – DC Electricity ALL questions