Year 9 Science · Unit 3 · Lesson 17
Foundation Worksheet
Learning Goals
Match each term to its definition
Draw a line connecting each circuit component on the left to its correct symbol description and function on the right. Or write the matching letter next to each component.
| Component | Your answer | Symbol description & function |
|---|---|---|
| Cell | A. Circle with an "A", measures the rate of current flow in a circuit; connected in series | |
| Bulb (lamp) | B. Zigzag line, opposes current flow; used to limit current in a circuit | |
| Switch | C. One long and one short parallel line, provides voltage (electrical "push") to the circuit | |
| Resistor | D. Circle with a cross inside, converts electrical energy to light and heat | |
| Voltmeter | E. A gap in a line that can be opened or closed, controls whether current flows | |
| Ammeter | F. Circle with a "V", measures potential difference; connected in parallel |
Fill the gap
Choose the correct word from the word bank to complete each sentence about how electricity flows in a simple torch circuit.
A torch contains a battery, a bulb and metal wires that form a closed . The battery provides the electrical "push" that moves electrons through the wires. The metal wires are made of copper, which is a good because it has very low and allows electrons to flow freely. The plastic coating on the wires is an , which prevents electricity from flowing somewhere it should not go. The rate at which electrons flow past a point is called , measured in the unit .
1. Define voltage and current in your own words. Give the unit for each quantity.
2. A student removes one wire from a simple circuit containing a battery, switch and bulb. Explain why the bulb goes out immediately, using the terms "complete circuit" and "current" in your answer.
Wrap Up
In one sentence, what was the main idea of this lesson?