Year 9 Science · Unit 3 · Lesson 20

Checkpoint 3, Circuits, Series, Parallel & Ohm's Law

Foundation Worksheet

Name

Date

Class

Learning Goals

Recall key vocabulary from Lessons 17–19: voltage, current, resistance, series, parallel, Ohm's Law.
Use context clues to complete sentences about how home circuits work.
Sort concepts into the correct topic area across the three lessons.

Warm Up

Fill the gap

Choose the correct word from the word bank to complete each sentence about how home circuits work.

voltage current resistance series parallel Ohm's Law circuit amperes watts

Australian homes use wiring, which means each appliance is connected across the same two supply points. Every appliance in the house receives the full of 240 V, regardless of what else is switched on. The flow of charge around the is called , measured in (A). The formula that links voltage, current, and is called , written as V = I × R.

Your Turn

Sort it!

Write each statement into the correct column of the table. Each statement belongs to exactly one concept area.

Current is the same at every point V = IR Each branch gets full battery voltage One break stops the whole circuit I = V ÷ R Used in Australian home wiring Voltage is shared among components Doubling voltage doubles current (ohmic) One branch failing does not stop others R = V ÷ I Old-style Christmas lights Straight line on a V-I graph

Series Circuit

Parallel Circuit

Ohm's Law

Show What You Know

1. A student uses a 12 V battery and a 6 Ω resistor. Use Ohm's Law to calculate the current. Show your working including the formula.

Recall 2 marks

2. In a parallel circuit, what property of the circuit stays the same across all branches? What property splits between branches?

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?