Electricity - Current and Circuits
Science · Grade 9 · Week 35 · 25 questions
Electricity powers modern life — from phones to cities. Understanding circuits, current, voltage, and resistance helps you grasp how electrical devices work.
What you'll practise
- Draw and interpret simple circuit diagrams
- Calculate current, voltage, and resistance
- Distinguish between series and parallel circuits
- Understand conductors and insulators
All 25 questions in this Electricity - Current and Circuits quiz
Grade 9 Science — Electricity - Current and Circuits: 25 practice questions with instant scoring and explanations.
- Electric current is defined as:
- The SI unit of electric current is:
- Potential difference is measured in:
- If 5 coulombs of charge pass through a cross-section in 2 seconds, the current is:
- Ohm's law states that I = V/R. Which is the correct relationship?
- If a resistor has V = 12V and I = 3A, what is the resistance?
- Resistance is a measure of:
- The resistance of a conductor depends on:
- If the length of a wire is doubled while keeping other factors constant, the resistance:
- If the cross-sectional area of a wire is doubled while keeping other factors constant, the resistance:
- The resistivity of a material depends on:
- A good conductor has:
- An ammeter is connected in a circuit:
- A voltmeter is connected:
- The internal resistance of an ideal ammeter is:
- The internal resistance of an ideal voltmeter is:
- If a wire of resistance 5 Ω carries a current of 2 A, the potential difference across it is:
- In a series circuit with two resistors R₁ = 3 Ω and R₂ = 6 Ω, the total resistance is:
- The equivalent resistance of two resistors 4 Ω and 4 Ω in parallel is:
- A fuse in an electrical circuit is used to:
- An earth wire in a plug is connected to:
- Superconductors have a resistance of:
- The resistance of a filament bulb:
- When a metal wire is heated, its resistance:
- A circuit breaker differs from a fuse in that it:
Question 1 of 250 correct so far