Current Electricity
Physics ⇒ Electricity and Magnetism
Current Electricity starts at 8 and continues till grade 12.
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See sample questions for grade 12
A circuit consists of three resistors of 2 Ω, 3 Ω, and 5 Ω connected in series. What is the total resistance?
Define electromotive force (emf).
Describe the difference between direct current (DC) and alternating current (AC).
Describe the effect of temperature on the resistance of a metallic conductor.
Explain the term 'internal resistance' of a cell.
Explain why metals are good conductors of electricity.
If the potential difference across a conductor is doubled, what happens to the current (assuming resistance remains constant)?
State Kirchhoff's Voltage Law.
State Ohm's Law.
State the relationship between current density (J), electric field (E), and conductivity (σ).
A student connects a voltmeter across a resistor in a circuit and observes that the voltmeter reading is less than the actual potential difference across the resistor. What could be the reason for this observation?
Explain why a fuse is always connected in series with the electrical device it is meant to protect.
