Power Sources & Electronic Components is one of 9 topics in the Grade 10 Electrical 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 does a photovoltaic (solar) cell do?
Directly converts sunlight into electrical energy through the photovoltaic effect
Stores electrical charge for later use
Converts electrical energy into mechanical rotation
Converts AC current into DC current
Answer: Directly converts sunlight into electrical energy through the photovoltaic effect — A photovoltaic (solar) cell directly converts sunlight into electrical energy through the photovoltaic effect.
Easy
2. Which formula correctly defines potential difference (V) in terms of energy transferred (E) and charge (Q)?
V = E/Q
V = EQ
V = Q/E
V = E + Q
Answer: V = E/Q — Potential difference is defined by V = E/Q, energy transferred (in joules) divided by charge moved (in coulombs).
Medium
3. Name the term for the energy supplied by a source per unit of charge, before any energy is lost overcoming the source's own internal resistance.
Answer: electromotive force — Electromotive force (EMF) is the energy supplied by a source per unit of charge, before any energy is lost overcoming the source's own internal resistance.
