Electricity — Current and Circuits

Grade 10 Science — Electricity — Current and Circuits: 25 practice questions with instant scoring and explanations.

1. Electric current is defined as:
2. The SI unit of electric current is:
3. 1 Ampere equals:
4. Potential difference is measured in:
5. Ohm's law states V = IR. This is true when:
6. Calculate current when V = 10V and R = 2Ω:
7. Resistance of a wire depends on:
8. Resistivity formula is ρ = RA/L. If R increases, which factor increases?
9. When resistors are connected in series, the equivalent resistance:
10. When resistors are connected in parallel, equivalent resistance:
11. For series combination: R_eq = R₁ + R₂. If R₁ = 3Ω and R₂ = 6Ω, find R_eq:
12. For parallel combination: 1/R_eq = 1/R₁ + 1/R₂. If R₁ = 6Ω and R₂ = 3Ω, find R_eq:
13. The resistance of a conductor is directly proportional to:
14. The resistance of a conductor is inversely proportional to:
15. If a wire is stretched to double its length without changing volume, its resistance:
16. Resistivity of a material:
17. At constant voltage, if resistance increases, current:
18. Three resistors of 2Ω each are connected in parallel. Equivalent resistance is:
19. A wire of resistance 10Ω is cut into 5 equal pieces. Resistance of each piece is:
20. If V = 12V across a 4Ω resistor, the power dissipated is:
21. Current through a circuit is 2A with resistance 5Ω. Voltage across circuit is:
22. A series circuit has total resistance 15Ω and current 0.5A. Total voltage is:
23. The direction of conventional current is:
24. Superconductors have resistance of:
25. The resistance of a metal wire increases with: