Electrical Circuits, Components & Ohm's Law is one of 9 topics in the Grade 9 Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What happens to the voltages of cells connected in SERIES?
They add together, giving a higher total voltage
They cancel each other out completely
They stay exactly the same as one single cell
They are divided by the number of cells
Answer: They add together, giving a higher total voltage — Cells connected in series (one after another, positive to negative) add their voltages together, giving a higher total voltage than a single cell.
Easy
2. In a circuit with lamps connected in PARALLEL, what happens if one lamp's filament breaks?
The other lamps keep working independently, since each has its own separate current path
All the lamps immediately go out, since the circuit is fully broken
Only the lamp directly next to the broken one goes out
The remaining lamps all become permanently brighter
Answer: The other lamps keep working independently, since each has its own separate current path — Lamps in parallel each have their own separate current path, so if one breaks, the others keep working independently, unlike lamps in series where one break stops the whole circuit.
Medium
3. Name the logical arrangement created by connecting two switches in SERIES, where current can only flow if BOTH switches are closed.
Answer: AND logic — Switches in series create AND logic -- current can only flow if this switch AND that switch are both closed.
