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 60 W, 120 V bulb is connected to a 120 V supply. What is the current through the bulb?
A battery has an emf of 12 V and an internal resistance of 1 Ω. If a current of 2 A is drawn from the battery, what is the terminal voltage?
A circuit consists of three resistors of 2 Ω, 3 Ω, and 5 Ω connected in series. What is the total resistance?
A circuit contains two resistors, 4 Ω and 6 Ω, connected in parallel. What is the equivalent resistance?
A current of 3 A flows for 4 minutes. How much charge passes through the wire?
A resistor of 10 Ω is connected across a 5 V battery. Calculate the current flowing through the resistor.
A wire of length 2 m and cross-sectional area 1 mm2 has a resistivity of 1.7 × 10-8 Ω·m. Calculate its 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 battery of emf 9 V and internal resistance 0.5 Ω is connected to a load resistor of 4.5 Ω. Calculate the energy dissipated as heat in the internal resistance when 10 C of charge flows through the circuit.
A circuit consists of a 24 V battery, a 2 Ω resistor, and a 4 Ω resistor connected in series. Calculate the power dissipated in the 4 Ω resistor.
A copper wire and an aluminum wire of equal length and cross-sectional area are connected in series to a battery. If the resistivity of copper is lower than that of aluminum, which wire will have a higher electric field across it? Justify your answer.
A potentiometer wire of length 1 m has a resistance of 10 Ω. It is connected in series with a 490 Ω resistor and a 5 V battery. What is the potential gradient along the potentiometer wire?
