Electrical Systems & Control is one of 9 topics in the Grade 8 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. Which of the following is an OUTPUT device in a circuit?
A buzzer
An electrochemical cell
A solar panel
A generator
Answer: A buzzer — A buzzer is an output device, using electrical energy to produce sound; cells, solar panels and generators are input devices.
Easy
2. What is a short circuit?
Current finding an unintended, very low-resistance path, bypassing the components meant to use that energy
A circuit that is physically shorter than 1 metre in length
A circuit containing only one single component
A completely safe, normal way for a circuit to operate
Answer: Current finding an unintended, very low-resistance path, bypassing the components meant to use that energy — A short circuit occurs when current finds an unintended, very low-resistance path, bypassing the components that are meant to use that energy -- a genuine safety hazard.
Medium
3. Give ONE word for the input device that converts sunlight directly into electrical energy.
Answer: photovoltaic cell — A photovoltaic cell (solar cell) converts sunlight directly into electrical energy, a renewable energy input device.
