Page 3 - Competency Based Worksheet- electricity and circuits

Based on the table given:

Material Bulb Glows? (Yes/No) Conclusion

Copper wire Yes Conductor

Plastic straw No Insulator

Iron nail Yes Conductor

Glass rod No Insulator

Aluminium foil Yes Conductor

Wooden stick No Insulator

a) Which materials are good conductors of electricity?
b) Which materials did not allow the bulb to glow?
c) What conclusion can be drawn about materials that do not conduct
electricity?
d) Which materials would you choose to complete a circuit?
e) Which material in the table is a metal but did not conduct electricity?
12. Activity-Based Question – Ramya’s Circuit

a) When Ramya puts a metal spoon in the circuit, the bulb glows. What does
this show?
b) The bulb does not glow when a plastic pen is connected. Why?
c) How does this activity help in choosing materials for electrical wiring?
13. Make Your Own Torch

a) What are the energy conversions happening inside your torch?
b) If you replace the bulb with an LED, what advantage does it provide?
c) Predict what happens if you use a rubber string instead of a metal wire in the
circuit.
14. Draw labelled diagrams of:
a) Open Circuit
b) Closed Circuit
(Use 2 cells in each diagram)